As they looked about, their eyes became accustomed to the dim, eery, phosphorescent illumination. They saw little worm-like creatures now and again appear from tiny holes between stalagmites in the jagged floor; and, as Phil wondered in his mind how long it would be before they would be reduced to using them for food, a strange mole-sized animal scraped from the darkness and pecked at one of them. As it slithered away, a writhing shape in its mouth, Holmes muttered bitterly: "A competitor!" Vague, flitting forms haunted the gloom among the stalactites of the distorted ceiling—hints of the things that lived in the terrible silence of this nether world. Here Time had paused, and life had halted in primate form.

A little moan came from Sue Guinness's pale lips. She plucked at her arm; a sickly white worm, only an inch long, had fallen on it from the ceiling. "Oh!" she gasped. "Oh!"

Phil drew her closer to him, and walked with her over to Quade's wrecked borer. "Let's see what we've got here," he suggested cheerfully.

The machine was over on its side, the metal mangled and crushed beyond repair. Nevertheless, he squeezed into it. "Stand back!" he warned. "I'm going to try its rockets!" There was a click of broken machinery, and that was all. "Rockets gone," Phil muttered.

He pulled another lever over. There was a sputter from within the borer, then a furious roar that sent great echoes beating through the cavern. A cloud of dust reared up before the bottom of the machine, whipped madly for a moment, and sank as the bellow of sound died down. Sue saw that a rocky rise in the floor directly in front of the disintegrators had been planed off levelly.

Phil scrambled out. "The disintegrators work," he said, "but a lot of good they do us. The borer's hopelessly cracked." He shrugged his shoulders, and with a discouraged gesture cast to the ground a coil of rope he had found inside.

Then suddenly he swung around. "Professor!" he called to the old figure standing bowed beneath the hole in the ceiling. "There's a draft blowing from somewhere! Do you feel it?"

Guinness felt with his hands a moment and nodded slowly. "Yes," he said.

"It's coming from this way!" Sue said excitedly, pointing into the darkness on one side of the cavern. "And it goes up the hole we made in the ceiling!"

Phil turned eagerly to the old inventor. "It must come from somewhere," he said, "and that somewhere may take us toward the surface. Let's follow it!"

"We might as well," the other agreed wearily. His was the tone of a man who has only a certain time to live.

But Phil was more eager. "While there's life, there's hope," he said cheerfully. "Come on, Sue, Professor!" And he led the way forward toward the dim, distorted rock shapes in the distance.

* * * * *

The roof and sides of the cavern angled down into a rough, tunnel-like opening, from which the draft swept. It was a heavy air, weighted with the smell of moist earth and lifeless water and a nameless, flat, stale gas. They slowly made their way through the impeding stalagmites, surrounded by a dark blur of shadows, the ghostly phosphorescent light illuminating well only the few rods around them. Utter silence brooded over the tunnel.

Phil paused when they had gone about seventy-five feet. "I left that rope behind," he said, "and we may need it. I'll return and get it, and you both wait right here." With the words he turned and went back into the shadows.

He went as fast as he could, not liking to leave the other two alone. But when he had retrieved the rope and tied it to his waist, he permitted himself a last look up as he passed under the hole in the ceiling—and what he saw there tensed every muscle in his body, and made his heart beat like mad. Again there was a tiny spot of orange in the blackness above!

"Professor!" he yelled excitedly. "Sue! Come here! The sphere's coming back!"

There was no doubt about it. The pin-point of light was growing each second, with the flame of the descending exhausts. Guinness and his daughter ran from the tunnel, and, guided by Phil's excited ejaculations, hurried to his side. Their eyes confirmed what his had seen. The earth-borer was coming down!

"But," Guinness said bewilderedly, "those rockets were enough to lift him!"

This was a mystery. Even though ten rockets were on—ten tiny spots of orange flame—the sphere came down swiftly. The same force which some time before had lifted it slowly up was now insufficient. The roar of the tubes rose rapidly. "Get back!" Phil ordered, remembering the danger, and they all retreated to the mouth of the tunnel, ready to peep cautiously around the edge. Holmes' jaws were locked tight with grim resolution. Quade was coming back! he told himself exultantly. This time he must not go up alone! This time—!

But his half-formed resolutions were idle. He could not know what frightful thing was bringing Quade down—what frightful experience was in store for them all....

CHAPTER IV

Spawn of the Cavern

In a crescendo of noise that stunned their ears, the earth-borer came down. Tongues of fire flared from the hole, speared to the ground and were deflected upward, cradling the metal ball in a wave of flame. Through this fiery curtain the machine slowly lowered to the floor, where a shower of sparks spattered out, blinding the eyes of the watchers with their brilliance. For a full minute the orange-glowing sphere lay there, quivering from the vibration; then the exhausts died and the wave of flame wavered and sank into nothingness. While their ear-drums continued the thunder, the three stared at the borer, not daring to approach, yet striving to solve the mystery of why it had sunk despite the up-thrust of ten rocket tubes.

As their eyes again became accustomed to the familiar phosphorescent illumination, pallid and cold after the fierce orange flame, they saw why—and their eyes went wide with surprise and horror.

A strange mass was covering the top of the earth-borer—something that looked like a heap of viscid, whitish jelly. It was sprawled shapelessly over the round upper part of the metal sphere, a half-transparent, loathsome stuff, several feet thick in places.

And Phil Holmes, striving to understand what it could be, saw an awful thing. "It's moving!" he whispered, unconsciously drawing Sue closer. "There's—there's life in it!"

Lazy quiverings were running through the mound of jelly, pulsings that gave evidence of its low organism. They saw little ripples of even beat run over it, and under them steady, sluggish convulsions that told of life; that showed, perhaps, that the thing was hungry and preparing to move its body in quest of food.

It was alive, unquestionably. The borer lay still, but this thing moved internally, of itself. It was life in its lowest, most primate form. The mass was mind, stomach, muscle and body all in one, stark and raw before their startled eyes.

"Oh, God!" Phil whispered through the long pause. "It can't be real!..."

"Protoplasm—a monster amoeba," David Guinness's curiously cracked voice said. "Just as it exists on the surface, only microscopically. Primate life...."

* * * * *

The lock of the earth-borer clicked. Phil gasped. "Quade is coming out!" he said. A little cry of horror came from Sue. And the metal door opened.

James Quade stepped through, automatic in hand. He was fresh from the light inside, and he could not see well. He was quite unconscious of what was oozing down on him from above, of the flabby heap that was carefully stretching down for him. He peered into the gloom, looking for the three he had deserted, and all the time an arm from the mass above crept nearer. Sue Guinness's nerves suddenly gave, and she shrieked; but Quade's ears were deaf from the borer's thunder, and he did not hear her.

It was when he lifted one foot back into the sphere—probably to get out the searchlight—that he felt the thing's presence. He looked up—and a strange sound came from him. For seconds he apparently could not move, stark fear rooting him to the ground, the gun limp in his hand.

Then a surge ran through the mound of flesh, and the arm, a pseudopod, reached more rapidly for him.

It stung Quade into action. He leaped back, brought up his automatic, and fired at the thing once; then three times more. He, and each one of the others, saw four bullets thud into the heap of pallid matter and heard them clang on the metal of the sphere beneath. They had gone right through its flesh—but they showed no slightest effect!

Quade was evidently unwilling to leave the sphere. Jerking his arm up he brought his trigger finger back again. A burst of three more shots barked through the cavern, echoing and re-echoing. The man screamed an inarticulate oath as he saw how useless his bullets were, and hurled the empty gun at the monster—which was down on the floor now, and bunching its sluggish body together.

The automatic went right into it. They could all see it there, in the middle of the amorphous body, while the creature stopped, as if determining whether or not it was food. Quade screwed his courage together in the pause, and tried to dodge past to the door of the sphere; but the monster was alert: another pseudopod sprang out from its shapeless flesh, sending him back on his heels.

The feeler had all but touched Quade, and with the closeness of his escape, the remnants of his courage gave. He yelled, and turned and ran.

* * * * *

He ran straight for the three who watched from the tunnel mouth, and the mound of shapeless jelly came fast on his trail. It came in surging rolls, like thick fluid oozing forward; it would have been hard to measure its size, for each moment it changed. The only impression the four humans had was that of a wave of half-transparent matter that one instant was a sticky ball of viscid flesh and the next a rapidly advancing crescent whose horns reached far out on each flank to cut off retreat.

By instinct Phil jerked Sue around and yelled at the professor to run, for the old man seemed to be frozen into an attitude of fearful interest. Bullets would not stop the thing—could anything? Holmes wondered. He could visualize all too easily the death they would meet if that shapeless, naked protoplasmic mass overtook and flowed over them....

But he wasted no time with such thoughts. They ran, all three, into the dark tunnel.

Quade caught up with them quickly. Personal enmity was suspended before this common peril. They could not run at full speed, for a multitude of obstacles hindered them. Tortuous ridges of rock lay directly across their path, formations that had been whipped in some mad, eon-old convulsion and then, through the ages, remained frozen into their present distortion; black pits gaped suddenly before them; half-seen stalagmites, whose crystalline edges were razor-sharp, tore through to their flesh. Haste was perilous where every moment they might stumble into an unseen cleft and go pitching into awful depths below. They were staking everything on the draft that blew steadily in their faces; Phil told himself desperately that it must lead to some opening—it must!

But what if the opening were a vertical, impassable tunnel? He would not think of that....

Old David Guinness tired fast, and was already lagging in the rear when Quade gasped hoarsely:

"Hurry! It's close behind!"

* * * * *

Surging rapidly at a constant distance behind them, it came on. It was as fast as they were, and evidently untiring. It was in its own element; obstacles meant nothing to it. It oozed over the jagged ridges that took the humans precious moments to scramble past, and the speed of its weird progress seemed to increase as theirs faltered. It was a heartless mass driven inexorably by primal instinct towards the food that lay ahead. The dim phosphorescent illumination tinged its flabby tissues a weird white.

The passage they stumbled through narrowed. Long irregular spears of stalactites hung from the unseen ceiling; others, the drippings of ages, pronged up from the floor, shredding their clothes as they jarred into them. One moment they were clambering up-hill, slipping on the damp rock; the next they were sliding down into unprobed darkness, reckless of where they would land. They were aware only that the water-odorous draft was still in their faces, and the hungry mound of flesh behind....

"I can't last much longer!" old Guinness's winded voice gasped. "Best leave me behind. I—I might delay it!"

For answer, Phil went back, grabbed him by the arm and dragged his tired body forward. He was snatching a glance behind to see how close the monster was, when Sue's frightened voice reached him from ahead.

"There's a wall here, Phil—and no way through!"

And then Holmes came to it. It barred the passage, and was apparently unbroken. Yet the draft still came!

"Search for where the draft enters!" he yelled. "You take that side!" And he started feeling over the clammy, uneven surface, searching frantically for a cleft. It seemed to be hopeless. Quade stood staring back into the gloom, his eyes looking for what he knew was surging towards them. His face had gone sickly white, he was trembling as if with fever, and he sucked in air with long, racking gasps.

"Here! I have it!" cried the girl suddenly at her end of the wall. The other three ran over, and saw, just above her head, a narrow rift in the rock, barely wide enough to squirm through. "Into it!" Phil ordered tersely. He grasped her, raised her high, and she wormed through. Quade scrambled to get in next, but Holmes shoved him aside and boosted the old man through. Then he helped the other.

A second after he had swung himself up, a wave of whitish matter rolled up below, hungry pseudopods reaching for the food it knew was near. It began to trickle up the wall....

* * * * *

The crack was narrow and jagged; utterly black. Phil could hear Quade frantically worming himself ahead, and he wondered achingly if it would lead anywhere. Then a faint, clear voice from ahead rang out:

"It's opening up!"

Sue's voice! Phil breathed more easily. The next moment Quade scrambled through; dim light came; and they were in another vast, ghostly-lit cavern.

The crack came out on its floor-level; Guinness was resting near, and his daughter had her hands on a large boulder of rock. "Let's shove it against the hole!" she suggested to Phil. "It might stop it!"

"Good, Sue, good!" he exclaimed, and at once all four of them strained at the chunk, putting forth every bit of strength they had. The boulder stirred, rolled over, and thudded neatly in front of the crack, almost completely sealing it. There was only a cleft of five inches on one side.

But their expression of relief died in their throats. A tiny trickle of white appeared through the niche. The amorphous monster was compressing itself to a single stream, thin enough to squeeze through even that narrow space.

They could not block it. They had nothing to attack it with. There was nothing to do but run.... And hope for a chance to double back....

As nearly as they could make out, this second cavern was as large as the first. They could dimly see the fantastic shapes of hundreds of stalactites hanging from the ceiling. Clumps of stalagmites made the floor a maze which they threaded painfully. The strong steady draft guided them like a radio beacon, leading them to their only faint hope of escape and life. Guinness, very tired, staggered along mechanically, a heavy weight on Phil's supporting arm; James Quade ran here and there in frantic spurts of speed. Sue was silent, but the hopelessness in her eyes tortured Phil like a wound. His shirt had long since been ripped to shreds; his face, bruised in the first place by the borer he had crashed in, now was scratched and bloody from contact with rough stalagmites.

* * * * *

Then, without warning, they suddenly found among the rough walls on the far side of the cavern, the birthplace of the draft. It lay at the edge of the floor—a dark hole, very wide. Black, sinister and clammy from the draft that poured from it, it pierced vertically down into the very bowels of the earth. It was impassable.

James Quade crumpled at the brink; "It's the end!" he moaned. "We can't go farther! It's the end of the draft!"

The hole blocked their forward path completely. They could not go ahead.... In seconds, it seemed, the slithering that told of the monster's approach sounded from behind. Sue's eyes were already fixed on the awful, surging mass when a voice off to one side yelled:

"Here! Quick!"

It was Phil Holmes. He had been scouting through the gloom, and had found something.

The other three ran to him. "There's another draft going through here," he explained rapidly, pointing to an angled crevice in the rocky wall. "There's a good chance it goes to the cavern where the sphere and the hole to the surface are. Anyway, we've got to take it. I'd better go first, after this—and you, Quade, last. I trust you less than the monster behind."

He turned and edged into the crack, and the others followed as he had ordered. Quickly the passageway broadened, and they found the going much easier than it had been before. For perhaps ten minutes they scrambled along, with the draft always on their backs and the blessed, though faint, fire of hope kindling again. In all that time they did not see their pursuer once, and the hope that they had lost it brought a measure of much needed optimism to drive their tired bodies onward. They found but few time-wasting obstacles. If only the tunnel would continue right into the original cavern! If only their path would stay clear and unhindered!

But it did not. The sound of Phil's footsteps ahead stopped, and when Sue and her father came up they saw why.

"A river!" Phil said.

* * * * *

They were standing on a narrow ledge that overhung an underground river. A fetid smell of age-old, lifeless water rose from it. Dimly, at least fifty feet across, they could see the other side, shrouded in vague shadows. The inky stream beneath did not seem to move at all, but remained smooth and hard and thick-looking.

They could not go around it. The ledge was only a few feet wide, and blocked at each side.

"Got to cross!" Phil said tersely.

Quade, sickly-faced, stared down. "There—there might be other things in that water!" he gasped. "Monsters!"

"Sure," agreed Phil contemptuously. "You'd better stay here." He turned to the others. "I'll see how deep it is," he said, and without the faintest hesitation dove flatly in.

Oily ripples washed back, and they saw his head poke through, sputtering. "Not deep," he said. "Chest-high. Come on."

He reached for Sue, helped her down, and did the same for her father. Holding each by the hand, Sue's head barely above the water, he started across. They had not gone more than twenty feet when they heard Quade, left on the bank, give a hoarse yell of fear and dive into the water. Their dread pursuer had caught up with them.

And it followed—on the water! Phil had hoped it would not be able to cross, but once more the thing's astounding adaptability dashed his hopes. Without hesitation, the whitish jelly sprawled out over the water, rolling after them with ghastly, snake-like ripples, its pallid body standing out gruesomely against the black, odorous tide.

Quade came up thrashing madly, some feet to the side of the other three. He was swimming—and swimming with such strength that he quickly left them behind. He would be across before they; and that meant there was a good chance that the earth-borer would go up again with only one passenger....

Phil fought against the water, pulling Sue and her father forward as best he could. From behind came the rippling sound of their shapeless pursuer. "Ten feet more—" Holmes began—then abruptly stopped.

There had been a swish, a ripple upstream. And as their heads turned they saw the water part and a black head, long, evil, glistening, pointing coldly down to where they were struggling towards the shore. Phil Holmes felt his strength ooze out. He heard Professor Guinness gasp:

"A water-snake!"

* * * * *

Its head was reared above the surface, gliding down on them silently, leaving a wedge of long, sluggish ripples behind. When thirty feet away the glistening head dipped under, and a great half-circle of leg-thick body arched out. It was like an oily stream of curved cable; then it ended in a pointed tail—and the creature was entirely under water....

With desperate strength Phil hauled the girl to the bank and, standing in several feet of water, pushed her up. Then he whirled and yanked old Guinness past him up into the hands of his daughter. With them safe, and Sue reaching out her hand for him, he began to scramble up himself.

But he was too late. There was a swish in the water behind him, and toothless, hard-gummed jaws clamped tight over one leg and drew him back and under. And with the touch of the creature's mouth a stiff shock jolted him; his body went numb; his arms flopped limply down. He was paralyzed.

Sue Guinness cried out. Her father stared helplessly at the spot where his young partner had disappeared with so little commotion.

"It was an eel," he muttered dully. "Some kind of electric eel...."

Phil dimly realized the same thing. A moment later his face broke the surface, but he could not cry out; he could not move his little finger. Only his involuntary muscles kept working—his heart and his lungs. He found he could control his breathing a little.... And then he was wondering why he was remaining motionless on the surface. Gradually he came to understand.

He had not felt it, but the eel had let go its hold on his leg, and had disappeared. But only for a moment. Suddenly, from somewhere near, its gleaming body writhed crazily, and a terrific twist of its tail hit Phil a glancing blow on the chest. He was swept under, and the water around him became a maelstrom. When next he bobbed to the tumultuous surface, he managed to get a much-needed breath of air—and in the swirling currents glimpsed the long, snake-like head of the eel go shooting by, with thin trickles of stuff that looked like white jelly clinging to it.

That explained what was happening. The eel had been challenged by the ameboid monster, and they were fighting for possession of him—the common prey.

* * * * *

The water became an inferno of whipping and lashing movements, of whitish fibers and spearing thrusts of a glistening black electric body. Unquestionably the eel was using its numbing electric shock on its foe. Time and time again Phil felt the amoeba grasp him, searingly, only to be wrenched free by the force of the currents the combat stirred up. Once he thudded into the bottom of the river, and his lungs seemed about to burst before he was again shot to the top and managed to get a breath. At last the water quieted somewhat, and Phil, at the surface, saw the eel bury its head in a now apathetic mound of flesh.

It tore a portion loose with savage jaws, a portion that still writhed after it was separated from the parent mass; and then the victor glided swiftly downstream, and disappeared under the surface....

Holmes floated helplessly on the inky water. He could see the amoeba plainly; it was still partly paralyzed, for it was very still. But then a faint tremor ran through it; a wave ran over its surface—and it moved slowly towards him once again.

Desperately Phil tried to retreat. The will was there, but the body would not work. Save for a feeble flutter of his hands and feet, he could not move. He could not even turn around to bid Sue and David Guinness good-by—with his eyes....

Then a fresh, loved voice sounded just behind him, and he felt something tighten around his waist.

"It's all right, dear!" the voice called. "Hang on; we'll get you out!"

Sue had come in after him! She had grasped the rope tied to his belt, and she and her father were pulling him back to the bank!

He wanted to tell her to go back—the amoeba was only feet away—but he could only manage a little croak. And then he was safe up on the ledge at the other side of the river.

* * * * *

A surge of strength filled his limbs, and he knew the shock was rapidly wearing off. But it was also wearing off of the monster in the water. Its speed increased; the ripplings of its amorphous body-substance became quicker, more excited. It came on steadily.

While it came, the girl and her father worked desperately over Phil, massaging his body and pulling him further up the bank. It had all but reached the bank when Holmes gasped:

"I think I can walk now. Where—where did Quade go to?"

Guinness gestured over to the right, up a dim winding passage through the rocks.

"Then we must follow—fast!" Phil said, staggering to his feet. "He may get to the sphere first; he'll go up by himself even yet! I'm all right!"

Despite his words, he could not run, and could only command an awkward walk. Sue lifted one of his arms around her shoulder, and her father took the other, and without a backward glance they labored ahead. But Phil's strength quickly returned, and they raised the pace until they had broken once more into a stumbling run.

How far ahead James Quade was, they did not know, but obviously they could follow where he had gone. Once again the draft was strong on their backs. They felt sure they were on the last stretch, headed for the earth-borer. But, unless they could overtake Quade, he would be there first. They had no illusions about what that would mean....

CHAPTER V

A Death More Hideous

Quade was there first.

When they burst out of a narrow crevice, not far from the funnel-shaped opening they had originally entered, they saw him standing beside the open door of the sphere as if waiting. The searchlight inside was still on, and in its shaft of light they could see that he was smiling thinly, once more his old, confident self. It would only take him a second to jump in, slam the door and lock it. He could afford a last gesture....

The three stopped short. They saw something he did not.

"So!" he observed in his familiar, mocking voice. He paused, seeing that they did not come on. He had plenty of time.

He said something else, but the two men and the girl did not hear what it was. As if by a magnet their eyes were held by what was hanging above him, clinging to the lip of the hole the sphere had made in the ceiling.

It was an amoeba, another of those single-celled, protoplasmic mounds of flesh. It had evidently come down through the hole; and now it was stretching, rubber-like, lower and lower, a living, reaching stalactite of whitish hunger.

Quade was all unconscious of it. His final words reached Phil's consciousness.

"... And this time, of course, I will keep the top disintegrators on. No other monster will then be able to weigh me down!"

He shrugged his shoulders and turned to the door. And that movement was the signal that brought his doom. Without a sound, the poised mass above dropped.

James Quade never knew what hit him. The heap of whitish jelly fell squarely. There was a brief moment of frantic lashing, of tortured struggles—then only tiny ripples running through the monster as it fed.

Sue Guinness turned her head. But the two men for some reason could not take their eyes away....

* * * * *

It was the girl's voice that jerked them back to reality. "The other!" she gasped. "It's coming, behind!"

They had completely forgotten the mass in the tunnel. Turning, they saw that it was only fifteen feet away and approaching fast, and instinctively they ran out into the cavern, skirting the sphere widely. When they came to Quade's wrecked borer Phil, who had snatched a glance behind, dragged them down behind it. For he had seen their pursuer abandon the chase and go to share in the meal of its fellow.

"We'd best not get too far away," he whispered. "When they leave the front of the borer, maybe we can make a dash for it."

For minutes that went like hours the young man watched, waiting for the creatures to be done, hoping that they would go away. Fortunately the sphere lay between, and he was not forced to see too much. Only one portion of one of the monsters was visible, lapping out from behind the machine....

At last his body tensed, and he gripped Sue and her father's arm in quick warning. The things were leaving the sphere. Or, rather, only one was. For Phil saw that they had agglutenated—merged into oneness—and now the monster that remained was the sum of the sizes of the original two. And more....

They all watched. And they all saw the amoeba stop, hesitate for a moment—and come straight for the wrecked borer behind which they were hidden.

"Damn!" Phil whispered hoarsely. "It's still hungry—and it's after us!"

David Guinness sighed wearily. "It's heavy and sluggish, now," he said, "so maybe if we run again.... Though I don't know how I can last any longer...."

Holmes did not answer. His eyes were narrowed; he was casting about desperately for a plan. He hardly felt Sue's light touch on his arm as she whispered:

"In case, Phil—in case.... This must be good-by...."

But the young man turned to her with gleaming eyes. "Good-by, nothing!" he cried. "We've still got a card to play!"

* * * * *

She stared at him, wondering if he had cracked from the strain of what he had passed through. But his next words assured her he had not. "Go back, Sue," he said levelly. "Go far back. We'll win through this yet."

She hesitated, then obeyed. She crept back from the wrecked borer, back into the dim rear, eyes on Phil and the sluggish mass that moved inexorably towards him. When she had gone fifteen or twenty yards she paused, and watched the two men anxiously.

Phil was talking swiftly to Professor Guinness. His voice was low and level, and though she could not hear the words she could catch the tone of assurance that ran through them. She saw her father nod his head, and he seemed to make the gesture with vigor. "I will," she heard him say; and he slapped Phil on the back, adding: "But for God's sake, be careful!"

And with these words the old man wormed inside Quade's wrecked borer and was gone from the girl's sight.

She wanted desperately to run forward and learn what Phil intended to do, but she restrained herself and obeyed his order. She waited, and watched; and saw the young man stand up, look at the slowly advancing monster—and deliberately walk right into its path!

Sue could not move from her fright. In a daze she saw Phil advance cautiously towards the amoeba and pause when within five feet of it. The thing stopped; remained absolutely motionless. She saw him take another short step forward. This time a pseudopod emerged, and reached slowly out for him. Phil avoided it easily, but by so narrow a margin that the girl's heart stopped beating. Then she saw him step back; and, snail-like, the creature followed, pausing twice, as if wary and suspicious. Slowly Phil Holmes drew it after him.

To Sue, who did not know what was his plan, it seemed a deliberate invitation to death. She forgot about her father, lying inside the mangled borer, waiting. She did not see that Phil was leading the monster directly in front of it....

* * * * *

It was a grotesque, silent pursuit. The creature appeared to be unalert; its movements were sloth-like; yet the girl knew that if Phil once ventured an inch too close, or slipped, or tried to dodge past it to the sphere, its torpidness would vanish and it would have him. His maneuvering had to be delicate, judged to a matter of inches. Tense with the suspense, the strain of the slow-paced seconds, she watched—and yet hardly dared to watch, fearful of the awful thing she might see.

It was a fantastic game of tag her lover was playing, with death the penalty for tardiness. The slow, enticing movements were repeated again and again, Phil advancing very close, and stepping back in the nick of time. Always he barely avoided the clutching white arms that were extended, and little by little he decoyed the thing onward....

Then came the end. As Holmes was almost in front of the wrecked machine, Sue saw him glance quickly aside—and, as if waiting for that moment when he would be off guard, the monster whipped forward in a great, reaching surge.

Sue's ragged nerves cracked: she shrieked. They had him! She started forward, then halted abruptly. With a tremendous leap, Phil Holmes had wrenched free and flung himself backwards. She heard his yell:

"Now!"

* * * * *

There was a sputter from the bottom of the outstretched borer; then, like the crack of a whip, came a bellow of awful sound.

A thick cloud of dust reared up, and the ear-numbing thunder rolled through the cavern in great pulsing echoes. And then Sue Guinness understood what the young man had been about.

The disintegrators of James Quade's borer had sent a broad beam of annihilation into the monster. His own machine had destroyed his destroyer—and given his intended victims their only chance to escape from the dread fate he had schemed for them.

Sue could see no trace of the creature in its pyre of slow-swirling dust. Caught squarely, its annihilation had been utter. And then, through the thunder that still echoed in her ear-drums, she heard a joyful voice.

"We got 'em!"

Through the dusty haze Phil appeared at her side. He flung his arms up exultantly, swept her off the ground, hugged her close.

"We got 'em!" he cried again. "We're free—free to go up!"

Professor David Guinness crawled from the borer. His face, for the first time since the descent, wore a broad smile. Phil ran over to him, slapped him on the back; and the older man said:

"You did it beautifully, Phil." He turned to Sue. "He had to decoy them right in front of the disintegrators. It was—well, it was magnificent!"

"All credit to Sue: she was my inspiration!" Phil said, laughing. "But now," he added, "let's see if we can fix those dead rocket-tubes. I have a patient up above—and, anyway, I'm not over-fond of this place!"

* * * * *

The three had won through. They had blasted four miles down from the surface of the earth. The brain of an elderly scientist, the quick-witted courage of a young engineer, had achieved the seemingly impossible—and against obstacles that could not have been predicted. Death had attended that achievement, as death often does accompany great forward steps; James Quade had gone to a death more hideous than that he devised for the others. But, in spite of the justice of it, a moment of silence fell on the three survivors as they came to the spot where his fate at last had caught up to him.

But it was only a moment. It was relieved by Professor Guinness's picking up the chunk of radium ore his former partner had hewn from the cavern's wall. He held it up for all to see, and smiled.

"Here it is," he said simply.

Then he led the way into his earth-borer, and the little door closed quietly and firmly into place.

For a few minutes slight tappings came from within, as if a wrench or a screwdriver were being used. Then the tappings stopped, and all was silence.

A choke, a starting cough, came from beneath the sphere. A torrent of rushing sound burst out, and spears of orange flame spurted from the bottom and splashed up its sides, bathing it in fierce, brilliant light. It stirred. Then, slowly and smoothly, the great ball of metal raised up.

It hit the edge of the hole in the ceiling, and hung there, hesitating. Side-rockets flared, and the sphere angled over. Then it slid, roaring, through the hole.

Swiftly the spots of orange from its rocket-tube exhausts died to pin-points. There were now almost twenty of them. And soon these pin-points wavered, and vanished utterly.

Then there was only blackness in the hole that went up to the surface. Blackness in the hole, calm night on the desert above—and silence, as if the cavern were brooding on the puny figures and strange machines that had for the first time dared invade its solitude, in the realms four miles within the earth....



The Lake of Light

By Jack Williamson



[Sidenote: In the frozen wastes at the bottom of the world two explorers find a strange pool of white fire—and have a strange adventure.]

The roar of the motor rang loud in the frosty air above a desert of ice. The sky above us was a deep purple-blue; the red sun hung like a crimson eye low in the north. Three thousand feet below, through a hazy blue mist of wind-whipped, frozen vapor, was the rugged wilderness of black ice-peaks and blizzard-carved hummocks of snow—a grim, undulating waste, black and yellow, splotched with crystal white. The icy wind howled dismally through the struts. We were flying above the weird ice-mountains of the Enderby quadrant of Antarctica.

That was a perilous flight, across the blizzard-whipped bottom of the world. In all the years of polar exploration by air, since Byrd's memorable flights, this area had never been crossed. The intrepid Britisher, Major Meriden, with the daring American aviatrix whom the world had known as Mildred Cross before she married him, had flown into it nineteen years before—and like many others they had never returned.

Faintly, above the purring drone of the motor, I heard Ray Summers' shout. I drew my gaze from the desolate plateau of ice below and leaned forward. His lean, fur-hooded face was turned back toward me. A mittened hand was pointing, and thin lips moved in words that I did not hear above the roar of the engine and the scream of the wind.

I turned and looked out to the right, past the shimmering silver disk of the propeller. Under the blue haze of ice-crystals in the air, the ice lay away in a vast undulating plain of black and yellow, broken with splotches of prismatic whiteness, lying away in frozen desolation to the rim of the cold violet sky. Rising against that sky I saw a curious thing.

It was a mountain of fire!

Beyond the desert of ice, a great conical peak pointed straight into the amethystine gloom of the polar heavens. It was brilliantly white, a finger of milky fire, a sharp cone of pure light. It shone with white radiance. It was brighter, far brighter, than is the sacred cone of Fujiyama in the vivid day of Japan.

* * * * *

For many minutes I stared in wonder at it. Far away it was; it looked very small. It was like a little heap of light poured from the hand of a fire-god. What it might be, I could not imagine. At first sight, I imagined it might be a volcano with streams of incandescent lava flowing down the side. I knew that this continent of mystery boasted Mt. Erebus and other active craters. But there was none of the smoke or lurid yellow flame which accompanies volcanic eruptions.

I was still watching it, and wondering, when the catastrophe took place—the catastrophe which hurled us into a mad extravaganza of amazing adventure.

Our little two-place amphibian was flying smoothly, through air unusually good for this continent of storms. The twelve cylinders of the motor had been firing regularly since we took off from Byrd's old station at Little America fifteen hours before. We had crossed the pole in safety. It looked as if we might succeed in this attempt to penetrate the last white spot on the map. Then it Happened.

A sudden crack of snapping metal rang out sharp as a pistol report. A bright blade of metal flashed past the wing-struts, to fall in a flashing arc. The motor broke abruptly into a mad, deep-voiced roar. Terrific vibration shook the ship, until I feared that it would go to pieces.

Ray Summers, with his usual quick efficiency, cut the throttle. Quickly the motor slowed to idling speed; the vibration stopped. A last cough of the engine, and there was no sound save the shrill screaming of the wind in the gloomy twilight of this unknown land beyond the pole.

"What in the devil!" I exclaimed.

"The prop! See!" Ray pointed ahead.

I looked, and the dreadful truth flashed upon me. The steel propeller was gone, or half of it at least. One blade was broken off at a jagged line just above the hub.

* * * * *

"The propeller! What made it break? I've never heard—"

"Search me!" Ray grinned. "The important thing is that it did. It was all-metal, of course, tested and guaranteed. The guarantee isn't worth much here. A flaw in the forging, perhaps, that escaped detection. And this low temperature. Makes metal as brittle as glass. And the thing may have been crystallized by the vibration."

The plane was coming down in a shallow glide. I looked out at the grim expanse of black ice-crags and glistening snow below us, and it was far from a comforting prospect. But I had a huge amount of confidence in Ray Summers. I have known him since the day he appeared, from his father's great Arizona ranch, to be a freshman in the School of Mines at El Paso, where I was then an instructor in geology. We have knocked about queer corners of the world together for a good many years. But he is still but a great boy, with the bluff, simple manners of the West.

"Do you think we can land?" I asked.

"Looks like we've got to," he said, grimly.

"And what after that?"

"How should I know? We have the sledge, tent, furs. Food, and fuel for the primus to last a week. There's the rifle, but it must be a thousand miles to anything to shoot. We can do our best."

"We should have had an extra prop."

"Of course. But it was so many pounds, when every pound counted. And who knew the thing would break?"

"We'll never get out on a week's provisions."

"Not a shot! Too bad to disappoint Captain Harper." Ray grinned wanly. "He ought to have the Albatross around there by this time, waiting for us." The Albatross was the ship which had left us at Little America a few months before, to steam around and pick us up at our destination beyond Enderby Land. "We're in the same boat with Major Meriden and his wife—and all those others. Lost without a trace."

"You've read Scott's diary—that he wrote after he visited the pole in 1912—the one they found with the bodies?"

"Yes. Not altogether cheerful. But we won't be trying to get out. No use of that." He looked at me suddenly, grinning again. "Say, Jim, why not try for that shining mountain we saw? It looks queer enough to be interesting. We ought to make it in a week."

"I'm with you," I said.

* * * * *

I did not speak again, for the jagged ice-peaks were coming rather near. I held my breath as the little plane veered around a slender black spire and dropped toward a tiny scrap of smooth snow among the ice-hummocks. I might have spared my anxiety. Under Ray's consumately skilful piloting, the skids struck the snow with hardly a shock. We glided swiftly over the ice and came to rest just short of a yawning crevasse.

"Suppose," said Ray, "that we spend the first night in the plane. We are tired already. We can keep warm here, and sleep. We've plenty of ice to melt for water. Then we're off for the shining mountain."

I agreed: Ray Summers is usually right. We got out the sledge, packed it, took our bearings, and made all preparations for a start to the luminous mountain, which was about a hundred miles away. The thermometer stood at twenty below, but we were comfortable enough in our furs as we ate a scanty supper and went to sleep in the cabin of the plane.

We started promptly the next morning, after draining the last of the hot chocolate from our vacuum bottles, which we left behind. We had a light but powerful sporting rifle, with telescopic sights, and several hundred rounds of ammunition. Ray put them in the pack, though I insisted that we would never need them, unless a quick way out of our predicament.

"No, Jim," he said. "We take 'em along. We don't know what we're going to find at the shining mountain."

The air was bitterly cold as we set out: it was twenty-five below and a sharp wind was blowing. Only our toiling at the sledge kept us warm. We covered eighteen miles that day, and made a good camp in the lee of a bare stone ridge.

That night there was a slight fall of snow. When we went on it was nearly thirty-five degrees below zero. The layer of fresh snow concealed irregularities in the ice, making our pulling very hard. After an exhausting day we had made hardly fifteen miles.

* * * * *

On the following day the sky was covered with gray clouds, and a bitterly cold wind blew. We should have remained in the tent, but the shortage of food made it imperative that we keep moving. We felt immensely better after a reckless, generous fill of hot pemmican stew; but the next morning my feet were so painful from frost-bite that I could hardly get on my fur boots.

Walking was very painful to me that day, but we made a good distance, having come to smoother ice. Ray was very kind in caring for me. I became discouraged about going on at all: it was very painful, and I knew there was no hope of getting out. I tried to get some of our morphine tablets, but Ray had them, and refused to be convinced that he ought to go on without me.

On the next march we came in sight of the luminous mountain, which cheered me considerably. It was a curious thing, indeed. A straight-sided cone of light it was, rather steeper than the average volcano. Its point was sharp, its sides smooth as if cut with a mammoth plane. And it shone with a pure white light, with a steady and unchanging milky radiance. It rose out of the black and dull yellow of the ice wilderness like a white finger of hope.

The next morning it was a little warmer. Ray had been caring for my feet very attentively, but it took me nearly two hours to get on my footgear. Again I tried to get him to leave me, but he refused.

We arrived at the base of the shining mountain in three more marches. On the last night the fuel for the primus was all gone, having been used up during the very cold weather, and we were unable to melt water to drink. We munched the last of our pemmican dry.

* * * * *

A few minutes after we had started on the last morning, Ray stopped suddenly.

"Look at that!" he cried.

I saw what he had seen—the wreck of an airplane, the wings crumpled up and blackened with fire. We limped up to it.

"A Harley biplane!" Ray exclaimed. "That is Major Meriden's ship! And look at that wing! It looks like it's been in an electric furnace!"

I examined the metal wing; saw that it had been blackened with heat. The metal was fused and twisted.

"I've seen a good many wrecks, Jim. I've seen planes that burned as they fell. But nothing like that. The fuselage and engines were not even afire. Jim, something struck out from that shining mountain and brought them down!"

"Are they—" I began.

Ray was poking about in the snow in the cockpits.

"No. Not here. Probably would have been better for them if they had been killed in the plane. Quick and merciful."

He examined the engines and propellers.

"No. Seems to be nothing wrong. Something struck them down!"

Soon we went on.

The shining mountain rose before us like a great cone of fire. It must have been three thousand feet high, and about that in diameter at the bottom. Its walls were as smooth and straight as though turned from milky rock crystal in a gigantic lathe. It shone with a steady, brilliantly white radiance.

"That's no natural hill!" Ray grunted beside me as we limped on.

We were less than a mile from the foot of the cone of fire. Soon we observed another remarkable thing about it. It seemed that a straight band of silvery metal rose from the snow about its foot.

"Has it a wall around it?" I exclaimed.

"Evidently," said Ray. "Looks as if it's built on a round metal platform. But by whom? When? Why?"

* * * * *

We approached the curious wall. It was of a white metal, apparently aluminum, or a silvery alloy of that metal. In places it was twenty-five feet high, but more usually the snow and ice was banked high against it. The smooth white wall of the gleaming mountain stood several hundred yards back from the wall.

"Let's have a look over it." Ray suggested. "We can get up on that hummock, against it. You know, this place must have been built by men!"

We clambered up over the ice, as he suggested, until our heads came above the top of the wall.

"A lake of fire!" cried Ray.

Indeed, a lake of liquid fire lay before us. The white aluminum wall was hardly a foot thick. It formed a great circular tank, nearly a mile across, with the cone of white fire rising in the center. And the tank was filled, to within a foot of the top, with shimmeringly brilliant white fluid, bright and luminous as the cone—liquid light!

Ray dipped a hand into it. The hand came up with fingers of fire, radiant, gleaming, with shining drops falling from them. With a spasmodic effort, he flung off the luminous drops, rubbed his hand on his garments, and got it back into its fur mitten.

"Gee, it's cold!" he muttered. "Freeze the horns off a brass billy-goat!"

"Cold light!" I exclaimed. "What wouldn't a bottle of that stuff be worth to a chemist back in the States!"

"That cone must be a factory to make the stuff." Ray suggested, hugging his hand. "They might pump the liquid up to the top, and then let it trickle down over the sides: that would explain why the cone is so bright. The stuff might absorb sunlight, like barium sulphide. And there could be chemical action with the air, under the actinic rays."

"Well, if somebody's making cold light, where does he use it?"

"I'd like to find out, and strike him for a hot meal," Ray said, grinning. "It's too cold to live on top of the ground around here. They must run it down in a cave."

"Then let's find the hole."

"You know it's possible we won't be welcome. This mountain of light may be connected with the vanishing of all the aviators. We'd better take along the rifle."

* * * * *

We set off around just outside the white metal wall. The snow and ice was irregularly banked against it, but the wall itself was smooth and unbroken. We had limped along for some two miles, or more than halfway around the amazing lake of light. I had begun to doubt that we would find anything.

Then we came to a square metal tower, ten feet on a side, that rose just outside the silvery wall, to a level with its top. The ice was low here; the tower rose twenty feet above its unequal surface. We found metal flanges riveted to its side, like the steps of a ladder. They were most inconveniently placed, nearly four feet apart; but we were able to climb them, and to look down the shaft.

It was a straight-sided pit, evidently some hundreds of feet deep. We could see a tiny square of light at the bottom, very far away. The flanges ran down the side forming the rungs of a ladder that gave access to whatever lay at the bottom.

Without hesitation, Ray climbed over the side and started down. I followed him, feeling a great relief in getting out of the freezing wind. Ray had the rifle and ammunition strapped to his back, along with a few other articles; and I had a small pack. We had abandoned the sledge, with the useless stove and the most of our instruments. Our food was all gone.

The metal flanges were fully four feet apart, and it was not easy to scramble down from one to another; certainly not easy for one who was cold, hungry, thirsty, worn out with a week of exhausting marches, and suffering the torture of frozen feet.

"You know, this thing was not built by men," Ray observed.

"Not built by men? What do you mean?"

"Men would have put the steps closer together. Jim, I'm afraid we are up against something—well—that we aren't used to."

"If men didn't build this, what did?" I was astounded.

"Search me! This continent has been cut off from the rest of the world for geologic ages. Such life as has been found here is not common to the rest of the earth. It is not impossible that some form of life, isolated here, has developed intelligence and acquired the power to erect that cone of light—and to burn the wing off a metal airplane."

My thoughts whirled madly as we clambered down the shaft.

* * * * *

It must have taken us an hour to reach the bottom. I did not count the steps, but it must have been at least a thousand feet. The air grew rapidly warmer as we descended. We both took off most of our heavy fur garments, and left them hanging on the rungs.

I was rather nervous. I felt the nearness of an intelligent, hostile power. I had a great fear that the owners of those steps would use them to find us, and then crush us ruthlessly as they had brought down Meriden's plane.

The little square of white light below grew larger. Finally I saw Ray swing off and stand on his feet in a flood of white radiance below me. The air was warm, moist, laden with a subtle unfamiliar fragrance that suggested growing things. Then I stood beside Ray.

We stood on the bare stone floor of a huge cavern. It must have been of volcanic origin. The walls glistened with the sparkling smoothness of volcanic glass. It was a huge space. The black roof was a hundred feet high, or more; the cave was some hundreds of feet wide. And it sloped away from us into dim distance as though leading into huger cavities below.

The light that shone upon us came from an amazing thing—a fall of liquid fire. From the roof plunged a sheer torrent of white brilliantly luminous fluid, falling a hundred feet into a shimmering pool of moon-flame. Shining opalescent mists swirled about it, and the ceaseless roar of it filled the cave with sound. It seemed that a stream of the phosphorescent stuff ran off down the cave from the pool, to light the lower caverns.

"Very clever!" said Ray. "They make the stuff up there at the cone and run it in here to see by."

"This warm air feels mighty good," I remarked, pulling off another garment.

Ray sniffed the air. "A curious odor. Smells like something growing. Where anything is growing there ought to be something to eat. Let's see what we can find."

Only black obsidian covered the floor about us. Cautiously we skirted the overflowing pool of white fire, and followed down the stream of it that flowed toward the inner cavern. We had gone but a few hundred yards when suddenly Ray stopped me with a hand on my arm.

"Lie flat!" he hissed. "Quick!"

He dived behind a huge mass of fire-born granite. I flung myself down beside him.

"Something is coming up the trail by the shining river. And it isn't a man! It's between us and the light; we should be able to see it."

* * * * *

Soon I heard a curious scraping sound, and a little tinkle of metal. I caught a whiff of a powerful odor—a strange, fishy odor—so strong that it almost knocked me down.

The thing that made the scraping and the tinkle and the smell came into view. The sight of it sickened me with horror.

It was far larger than a man; its body was heavy as a horse's, but nearer the ground. In form it suggested a huge crab, though it was not very much like any crustacean I had ever seen. It was mostly red in color, and covered with a huge scarlet shell. It had five pairs of limbs. The two forward pairs had pinchers, seemingly used as hands; it scraped along on the other three pairs. Yard-long antennae, slender and luminously green, wavered above a grotesque head. The many facets of compound eyes stood on the end of foot-long stalks.

The amazing crab-thing wore a metal harness. Bands of silvery aluminum were fastened about its shell, with little cases of white metal dangling to them. In one of its uplifted claws it carried what seemed to be an aluminum bar, two feet long and an inch thick.

It scraped lumberingly past, between us and the racing stream of white fire. It passed less than a dozen feet from us. The curious fishy smell of it was overpowering, disgusting.

Sweat of horror chilled my limbs. The monster emanated power, sinister, malevolent power, power intelligent, alien and hostile to man.

I trembled with the fear that it would see us, but it scrambled grotesquely on. When it was twenty yards past, Ray picked up a block of black lava that lay beneath his hand and hurled it silently and swiftly. It crashed splinteringly on the rocks far beyond the creature, on the other side of the stream of light.

In fascination I watched the monster as it paused as if astonished. The glittering compound eyes twisted about on their stalks, and the long shining green tentacles wavered questioningly. Then the knobbed limbs snapped the white metal tube to a level position. A metallic click came from it.

And a ray of red light, vivid and intense, burst from the tube. It flashed across the river of fire. With a dull, thudding burst it struck the rocks where the stone had fallen. It must have been a ray of concentrated heat. Rocks beneath it flashed into sudden incandescence, splintered and cracked, flowed in molten streams.

* * * * *

In a moment the intensely brilliant ruby ray flashed off. The rocks in the circle where it had struck faded to a dull red and then to blackness, still cracking and crumbling.

To my intense relief, the monstrous crab lumbered on.

"That," Ray whispered, "is what got Major Meriden's airplane wing."

When we could hear its scraping progress no longer, we climbed up from behind our boulder and continued cautiously down the cavern, beside the rushing luminous river. In half a mile we came to a bend. Rounding it, we gazed upon a remarkable sight.

We looked into a huge cavity in the heart of the earth. A vast underground plain lay before us, with the black lava of the roof arching above it. It must have been miles across, though we had no way to measure it, and it stretched down into dim hazy distance. Its level was hundreds of feet below us.

At our feet the glistening river of fire plunged down again in a magnificent flaming fall. Below, its luminous liquid was spread out in rivers and lakes and canals, over all the vast plain. The channels ran through an amazing jungle. It was a forest of fungus, of mushroom things with great fleshy stalks and spreading circular tops. But they were not the sickly white and yellow of ordinary mushrooms, but were of brilliant colors, bright green, flaming scarlet, gold and purple-blue. Huge brilliant yellow stalks, fringed with crimson and black, lifted mauve tops thirty feet or more. It was a veritable forest of flame-bright fungus.

In the center of this weirdly forested subterranean plain was a great lake, filled, not with the flaming liquid, but with dark crystal water. And on the bottom of that lake, clearly visible from the elevation upon which we stood, was a city!

* * * * *

A city below the water! The buildings were upright cylinders in groups of two or three, of dozens, even of hundreds. For miles, the bottom of the great lake was covered with them. They were all of crystal, azure-blue, brilliant as cylinders turned from immense sapphires. They were vividly visible beneath the transparent water. Not one of them broke the surface.

Through the clear black water we saw moving hundreds, thousands of the giant crabs. The crawled over the hard, pebbled bottom of the lake, or swam between the crystal cylinders of the city. They were huge as the one we had seen, with red shells, great ominous looking stalked eyes, luminous green tentacular antennae and knobbed claws on forelimbs.

"Looks as if we've run on something to write home about," Ray muttered in amazement.

"A whole city of them! A whole world! No wonder they could build that cone-mountain for a lighting plant!"

"When they got to knocking down airplanes with that heat-ray," he speculated, "they were probably surprised to find that other animals had developed intelligence."

"Do you suppose those mushroom things are good to eat?"

"We can try and see—if the crabs don't get us first with a heat-ray. I'm hungry enough to try anything!"

Again we cautiously advanced. The river of light fell over a sheer precipice, but we found a metal ladder spiked to the rock, with rungs as inconveniently far apart as those in the shaft. It was five hundred feet, I suppose, to the bottom; it took us many minutes to descend.

At last we stepped off in a little rocky clearing. The forest of brilliant mushrooms rose about us, great fleshy stalks of gold and graceful fringes of black and scarlet about them, with flattened heads of purple.

We started eagerly across toward the fungoid forest. I had visions of tearing off great pieces of soft, golden flesh and filling my aching stomach with it.

We were stopped by a sharp, poignantly eager human cry.

A human being, a girl, darted from among the mushroom stalks and ran across to us. Sobbing out great incoherent cries, she dropped at Ray's feet, wrapped her arms about his knees and clung to him, while her slender body was wracked with sobbing cries.

* * * * *

My first impression was that she was very beautiful—and that impression I was never called upon to revise. About her lithe young body she had the merest scrap of some curious green fabric—ample in the warm air of the great cavern. Luxuriant brown hair fell loose about her white shoulders. She was not quite twenty years old, I supposed; her body was superbly formed, with the graceful curves and the free, smooth movements of a wild thing.

Ray stood motionless for a moment, thunder-struck as I was, while the sobbing girl clung to his knees. Then the astonishment on his face gave place to pity.

"Poor kid!" he murmured.

He bent, took her tenderly by the shoulder, helped her to her feet.

Her beauty burst upon us like a great light. Smoothly white, her skin was, perfect. Wide blue eyes, now appealing, even piteous, looked from beneath a wealth of golden brown hair. White teeth, straight and even, flashed behind the natural crimson of her lips.

She stood staring at Ray, in a sort of enchantment of wonder. An eager light of incredible joy flamed in her amazing eyes; red lips were parted in an unconscious smile of joy. She looked like the troubled princess in the fairy tale, when the prince of her dreams appeared in the flesh.

"God, but you're beautiful!" Ray's words slipped out as if he were hardly conscious of them. He flushed quickly, stepped back a little.

The girl's lips opened. She voiced a curious cry. It was deep toned, pealing with a wonderful timbre. A happy burst of sound, like a baby makes. But strong, ringing, musically golden. And pathetically eager, pitifully glad, so that it brought tears to my eyes, cynical old man that I am.

I saw Ray wipe his eyes.

"Can you talk?" Ray put the question in a clear, deliberate voice, with great kindness ringing in it.

"Talk?" The chiming, golden voice was slow, uncertain. "Talk? Yes. I talked—with mother. But for long—I have had no need to talk."

"Where is your mother?" Ray's voice was gentle.

"She is gone. She was here when I was little." The clear, silvery voice was more certain now. "Once, when I was almost as big as she—she was still. She was cold. She did not move when I called her. The Things took her away. She was dead. She told me that sometime she would be dead."

* * * * *

Bright tears came in the wide blue eyes, trickled down over the perfect face. A pathetic catch was in the deliberate, halting voice. I turned away, and Ray put a handkerchief to his face.

"What is your name? Who are you?" Ray spoke kindly.

"I am Mildred. Mildred Meriden."

"Meriden!" Ray turned to me. "I bet this is a daughter of the major and his wife!"

"Father was the major," the girl said slowly. "He and mother came in a machine that flew, from a far land. The Things burned the machine with the red fire. They came here and the Things kept them. They made mother sing over the water. They killed father. I never saw him."

"I know," Ray, said gently. "We came from the same land. We saw your father's machine above."

"You came from outside! And you are going back? Oh, take me with you! Take me!" Piteous pleading was in her voice. "It is so—lonely since the Things took Mother away. Mother told me that sometime men would come, and take me away to see the people and the outside that she told me of. Oh, please take me!"

"Don't worry! You go along whenever we leave—if we can get out."

"Oh, I am so glad! You are very good!"

Impulsively, she threw her arms around Ray's neck. Gently, he disengaged himself, flushing a little. I noticed, however, that he did not seem particularly displeased.

"But can we get out?"

"Mother and I tried. We could never get out. The Things watch. They make me come to the water to sing, when the great bell rings."

"Are these things goods to eat?" I motioned to the brilliant fungal forest. I had begun to fear that Ray would never get to this very important topic.

Blue eyes regarded me. "Eat? Oh, you are hungry! Come! I have food."

* * * * *

Like a child, she grasped Ray's hand, pulled him toward the mushroom jungle. I followed, and we slipped in between the brilliantly golden, fleshy stalks. They rose to the tangle of bright feathery fringes above, huge and substantial as the trunks of trees.

In a few minutes we came to a wide, shallow canal, metal-walled, through which a slow current of the opalescent, luminous liquid was flowing. We crossed this on a narrow metal foot-bridge, and went on through the brilliant forest.

Suddenly we emerged into a little clearing, with the black waters of the great lake visible beyond it, across a quarter-mile of rocky beach. In the middle of the open space, rose three straight cylinders of azure crystal, side by side. Each must have been twenty feet in diameter, and forty high. They shone with a clear blue light, like the cylindrical buildings we had seen in the strange city of the crab-creatures below the great lake.

Mildred Meriden, the strangely beautiful girl who had known no other world than this amazing cavern empire where giant crabs reigned, beckoned us with unconscious queenly grace to enter the arched door in the blue sapphire wall of her remarkable abode of clustered cylinders.

The crystal of the walls seemed luminous, the lofty cylinders were filled with a liquid, azure radiance. The high round room we entered was strangely furnished. There was a silken couch, a bathing pool of blue crystal filled with sparkling water, a curious chest of drawers made of bright aluminum with a mirror of polished crystal, its top bearing odd combs and other articles. The furnishings must have been done by the giant crabs, under human direction.

Mildred led us quickly across the room, through an arched opening into another. A round aluminum table stood in the center of the room, with two curious metal chairs beside it. Odd metal cabinets stood about the shining blue walls. The girl made us sit down, and put dishes before us.

She gave us each a bowl of thick, sweetish soup, darkly red; placed before us a dish piled high with little circular cakes, crisp and brown, which had a tantalizing fragrance; poured for each of us a transparent crystal goblet full of clear amber drink.

We fell to with enthusiasm and abandon.

"The Things made this place for father," the girl told us, as she watched us eat, attentively replenishing the red soup in the great blue crystal bowl, or the little cakes, or the fragrant amber drink. "They would give him anything he wanted. But he tried to go away with mother, and they killed him."

"We must get out of here," Ray declared when at last we had done. "We must get together a lot of food, and enough clothing for all of us. We ought to be able to make it to the edge of the ice-pack. We've got to give these crab-things the slip; we ought to get off before they know we're here—unless they already do."

Mildred was eagerly attentive: she was so unused to human speech that it took the best of her efforts to understand us, though it seems that her mother had given her quite a wide education. She promised that there would be no difficulty about the food.

"Mother taught me how to fix food," she said. "She always said that sometime men would come, with weapons of fire and great noise that would tear and kill the Things. I have food ready, in bags—more than we can carry. I have, too, the furs that mother and father wore."

She ran into another room and returned with a great pile of fur garments, which we examined and found to be in good condition.

"Now is the time," Ray said. "I'd like to know more about the big crabs, but there'll be a chance for that, later. Mildred is the important thing, now. We must get her out. Then we can tell the world about this place and come back with a bigger expedition."

"You think we can reach the coast?"

"I think so. It might be hard on Mildred. But we will have food; we can probably find fuel for the stove in Meriden's plane, if the tanks were well sealed. And Captain Harper should have a relief party landed and sent to meet us. We should have only three or four hundred miles to go alone."

"Three or four hundred miles, over country like we've been crossing in the last week, with a girl! Ray, we'd never make it!"

"It's the only chance."

I said nothing more. I knew that I could stand no such march on my frozen feet, but I resolved to say nothing about it. I would help them as far as I could, and then walk out of camp some night. Men have done just that.

Mildred brought out sacks of the little cakes, and of a red powder that seemed to be the dried and ground flesh of a crimson mushroom. We made a pack for each of us, as heavy as we could carry.

* * * * *

Just before we were ready to start Ray took off my footgear and treated my feet from his medicine kit. I had feared gangrene, but he assured me that there was no danger if they were well cared for. Walking was still exquisitely painful to me as we slipped out through the arched door and into the fungoid forest beyond the three blue cylinders.

As rapidly and silently as possible we hastened through the brilliant fungous forest, across the river of opalescent liquid, to the foot of the fall of fire. A weird and splendid sight was that sheer arc of shimmering white flame, roaring into a pool of opal light, and surrounded with a mist of moon-flame.

We reached the foot of the metal ladder spiked to the rocks beside the fall and started up immediately. The going was not easy. The packs of food, heavy enough when we were on level ground, were difficult indeed to lift when one was scrambling up over rungs four feet apart.

Ray climbed ahead, with a piece of rope fastened from his waist to Mildred's, so that he could help her if she slipped. I was below the girl. We were halfway up the rock when suddenly a glare of red light shone upon me, casting my shadow sharply on the cliff. I looked up and saw the broad, intensely red beam of a heat-ray like that we had seen the giant crab use.

The ray came, evidently, from the shore of the great lake with its submerged city of blue cylinders. It fell upon the face of the cliff just above us. Quickly the ladder was heated to cherry red. The face of the rock grew incandescent, cracked. Hot sparks rained down upon us.

Slowly the ray moved down, toward us.

"Guess we'd better call it off," said Ray. "They have the advantage right now. Better get to climbing down, Jim. This ladder is going to be burning my hands pretty soon."

* * * * *

I climbed down. Mildred and Ray scrambled down behind me.

The ray followed us, keeping the metal at a cherry red just above Ray's hands.

I looked down and saw a dozen of the giant crabs lumbering up out of the fungoid jungle from the direction of the great lake. Hideous things they were, with staring, stalked eyes, shining green antennae, polished red shells, claw-armed limbs. Like the one that had passed us in the upper cavern, they wore glistening white metal accoutrements.

We clambered down, with the red ray following.

I dropped to the ground among them, wet with the sweat of horror. I reeled in nausea from the intolerable odor of the crab-things; it was indescribable, overpowering.

Curious rasping stridulations came from them, sounds which seemed to serve as means of communication, and which Mildred evidently understood.

"They say that you will not be harmed, but that you must not go out," she called down.

I was seized by the pincher-like claws, held writhing in an unbreakable grasp, while the glittering eyes twisted about, looked at me, and the shining green tentacles wavered questioningly over me. My stomach revolted at the horrible odor.

The crabs tore off my pack, even my clothing. Ray was similarly treated as soon as he reached the ground. Though they took Mildred's pack, they treated her with a curious respect.

In a few minutes they released us. They had taken the packs, the rifle and ammunition, our medicine kit and the few instruments we had brought with us down the shaft, even our clothing. They turned us loose stark naked. Ray's face and neck went beet-red when he saw Mildred standing by him.

The rasping sound came from one of them again.

"It says you may stay with me," Mildred said. "They will not harm you unless you try again to get away. If you do, you die—as father did. They will keep what they took from you."

* * * * *

Several of the creatures went scraping off, carrying the articles they had taken from us either in their claws or in the metal cases they wore. Several waited, staring at us with the stalked compound eyes, and waving the green antennae as if they were organs of some special sense.

Two of the creatures waited at the foot of the metal ladder, holding the long slender white tubes of the heat-ray in their claws.

"They say we can go now," Mildred said.

She led the way toward the edge of the brilliant jungle. She seemed to be without false modesty, for I saw her glancing with evident admiration at Ray's lithe and powerful white-skinned figure. We followed her into the giant mushrooms, glad to escape the overpowering stench of the crabs.

In a few minutes we arrived again at the strange building of the three blue cylinders. Mildred, noticing our discomfort, produced for each of us a piece of white silken fabric with which we draped ourselves.

She had noticed my difficulty in walking on bare feet. She had me bathe them, then dressed them with a soothing yellow oil, and bandaged them skilfully.

"Anyhow," she said later, "it is good to have both of you here with me. I am sorry indeed for you that you may never see your country again. But it is good fortune for me. I was so lonely."

"These damned crabs don't know me!" Ray Summers muttered. "They think I'll play around like a pet kitten, for the rest of my life! They'll get their eyes opened. We'll spend the winter on Palm Beach yet!"

"It seems to me that we're rather outnumbered." I said. "And it's rather more pleasant in here than outside."

"I'm going to get that rifle," Ray declared, "and give these big crabs a little respect for humanity!"

"Let's rest up a while first, anyhow," I urged.

* * * * *

Presently Mildred noticed how tired we were. She went into the third of the connected cylinders of blue crystal, was busy a few minutes and called us to the couches she had prepared there.

"You may sleep," she told us. "The Things never come here. And they said they would not harm you, if you did not try to go out."

We lay down on the silken beds. In a few minutes I was sleep. I awoke to feel a curious unease, a sense of impending catastrophe. Ray was bending over me, his face drawn with anxiety.

"Something's happened!" he whispered. "She's gone!"

I sat up, staring into the liquid blue vastness of the tall cylinder above us.

"Listen! What's that?"

A deep bell-note sounded out, brazen, clanging. Sonorous, throbbing, mighty, it rang through the cylindered rooms. Slowly it died; faded to silence with a last ringing pulse. Tense minutes of silence passed. Again it boomed out, throbbed, and died. After more long minutes there was yet a third.

"Outside, somewhere!"

Ray started; ran to the arched door. We looked out upon the dense forest of gold and crimson mushrooms that grew below the black cavern roof. Before us, across a few hundred yards of bare rocky beach, was the edge of the crystal lake with the city of blue cylinders upon its floor.

"God! What's that?" Ray gripped my arm crushingly.

A thin wailing scream came across the beach from the black lake. A piteous sound it was, plaintive, pleading. Higher and higher it rose, until it was a piercing silver note. Clear and sweet it was, but inexpressibly lonely, sorrowful, mournful. It sank slowly, died away. Again it rose and fell, and again.

"It's Mildred!" I gasped. "Didn't she say something about singing to the crabs?"

"Yes! I think she did. Well, if that's singing, it's wonderful! Had me feeling like I'd never see another human. But listen—"

* * * * *

Liquid, trilling notes were rising, pealing out in a queer, swift rhythm. It was happy, joyous, carefree. The rippling golden tones made me think of the caroling of birds on a spring morning. Swiftly it rose and fell, pure and clear as the tinkle of a mountain brook.

Mildred sang not words but notes of pure music.

The gay song died.

And the strong clear voice rose again with the force and challenge of bugle notes, with a swift marching time beating through it. It throbbed to a rhythm strange to me. It set my feet tingling to move; it set my heart to pulsing faster. It was a challenge to action, to battle.

Unconsciously obeying the suggestion of the song, Ray whispered, "Let's get over and see what's going on."

We leaped through the door and ran across four hundred yards of rocky beach to the edge of the lake. We stepped on a granite bluff a few yards above the water, to gaze upon as strange a sight as men ever saw.

The black water lay before us, a transparent crystal sheet. On its rocky bottom we could see the innumerable clusters of upright azure cylinders that were the city of the crabs. The blue cylinders seemed to bend and waver in the water.

A hundred yards away from us, over the dark water, was Mildred. She stood on a slender azure cylinder that came just to the surface. Tall, slender, superbly graceful, with only the scant bodice of green silken stuff about her, she looked like the statue of a goddess in white marble. Her head was thrown up, golden-brown hair fell behind her shoulders, and the pure notes of her song rang over the water.

Beyond her, all about her, were thousands upon thousands of the giant crabs, swimming at the surface of the water. Their green antenna rose above the water, a curious forest of luminous tentacles, flexing, wavering. Green coils moved and swung in time to the strange rhythm of her song.

The last note died. Her white arms fell in a gesture of finality. The thousands of twisting green antennae vanished below the water, and the giant red crabs swam swiftly back to the tall blue cylinders of their submerged city.

* * * * *

The white goddess turned and saw us.

Her voice rang out in a golden shout of welcome. With a clean dive she slipped into the water and came swimming swiftly toward us. Her slim white body glided through the crystal water as smoothly as a fish. Reaching the shore she sprang to her feet and ran to meet Ray.

"The Things come together when the giant bell rings, to listen to my song," she said. "They like my singing, as they liked mother's. But for that, they would not let us live. That is the reason they would not let us go."

"I like your singing, too," Ray informed her. "Though at first you made me cry. It was so lonely."

"The song was lonely because I have been lonely. Did you hear the glad song I sang because you have come?"

"Sure! Great stuff! Made me feel like a kid at Christmas!"

"Come," she said. "We will eat."

Like a child, she took Ray's hand again, smiling naively up at him as she led the way toward the three sapphire cylinders.

Back in the blue-vaulted dining room, Ray made Mildred sit with me at the little metal table while he served the little brown cakes and the dark-red soup and the fragrant amber drink. Mildred got up and brought a great metal bowl filled with tiny purple fruits that had a delicious, piquant tang.

Ray was deeply thoughtful as he ate. Suddenly he sat back and cried out:

"I've got it!"

"Got what?" I demanded.

"I want that rifle! Mildred can find out where it is. Then, when she sings, the crabs will all come. I'll get the gun, while she is singing, and hide it. Then when it comes time to get out, she will sing while you and I are getting our packs up the cliff. I can cover them with the rifle while she gets up to us."

"Looks good enough," I agreed, "provided they all come to hear the singing."

* * * * *

He explained the plan at greater length to the girl. She assured him that the crabs all come when the bell-notes sound. She thought that she could make them return her furs, and find out where they had put the gun.

My feet were much better than they had been, and Mildred dressed them again with the yellow oil. Ray examined them, said that I should be able to walk as well as ever in a few days.

Considerable time went by. Since the crabs had taken our watches, we had no very accurate way of counting days; but I think we slept about a dozen times. Ray and Mildred spent a good deal of time together, and seemed not altogether to hate each other. By the end of the time my feet were quite well; I did not even lose a toe.

We went over our plans for escape in great detail. The crabs had confiscated our clothing. Mildred managed to secure the return of her furs, and, incidentally, while she was about it, learned where the rifle was.

Fortunately, perhaps realizing that it would be ruined by water, the crabs had not taken it to their submerged city. Being amphibious, they lived above water as easily as below, and much of their industrial equipment was above the surface. The great pumps which lifted the white phosphorescent liquid from the canals back to the cone above the ground were located beyond the great lake. I did not see the place, but Ray tells me that they had great engines and a wealth of strange and complex machinery there. It was at these pumps that they had left our rifle and instruments, as Mildred found when she was recovering her furs.

They had taken our food, and we prepared as much more as we could carry, arranged sacks for it, and made quilted garments for ourselves.

* * * * *

Then the three brazen notes clanged out, and Mildred ran across the beach and swam out to the blue cylinder to sing. Ray slipped hurriedly away, while the green forest of antennae was still growing up from the water about the girl.

I waited above the beach, enchanted by the haunting, wordless melody of the gongs. It seemed that only a few minutes had passed, though it may have been an hour or more, when Ray was by my side again. He flourished the rifle.

"I've got it! In good shape, too. Hasn't even been fired, though it looks like they have opened a box of cartridges, and cut open one or two. Maybe they didn't understand the outfit—or it may be such a primitive weapon that they aren't interested in it."