"To stop it!" I cried. "I am perfectly desperate; I shall give her fair warning to-day, and the next time will be the last."

"Do nothing rash," said he.

"Rash!" I cried. "The only rash thing is that I should postpone it another hour." With that I rushed to my room, and here I am on the eve of what may be the great crisis of my life. I shall start at once. I have gained one thing to-day, for I have made one man, at least, realize the truth of this monstrous experience of mine. And, if the worst should happen, this diary remains as a proof of the goad that has driven me.

Evening. When I came to Wilson's, I was shown up, and found that he was sitting with Miss Penclosa. For half an hour I had to endure his fussy talk about his recent research into the exact nature of the spiritualistic rap, while the creature and I sat in silence looking across the room at each other. I read a sinister amusement in her eyes, and she must have seen hatred and menace in mine. I had almost despaired of having speech with her when he was called from the room, and we were left for a few moments together.

"Well, Professor Gilroy—or is it Mr. Gilroy?" said she, with that bitter smile of hers. "How is your friend Mr. Charles Sadler after the ball?"

"You fiend!" I cried. "You have come to the end of your tricks now. I will have no more of them. Listen to what I say." I strode across and shook her roughly by the shoulder "As sure as there is a God in heaven, I swear that if you try another of your deviltries upon me I will have your life for it. Come what may, I will have your life. I have come to the end of what a man can endure."

"Accounts are not quite settled between us," said she, with a passion that equalled my own. "I can love, and I can hate. You had your choice. You chose to spurn the first; now you must test the other. It will take a little more to break your spirit, I see, but broken it shall be. Miss Marden comes back to-morrow, as I understand."

"What has that to do with you?" I cried. "It is a pollution that you should dare even to think of her. If I thought that you would harm her——"

She was frightened, I could see, though she tried to brazen it out. She read the black thought in my mind, and cowered away from me.

"She is fortunate in having such a champion," said she. "He actually dares to threaten a lonely woman. I must really congratulate Miss Marden upon her protector."

The words were bitter, but the voice and manner were more acid still.

"There is no use talking," said I. "I only came here to tell you,—and to tell you most solemnly,—that your next outrage upon me will be your last." With that, as I heard Wilson's step upon the stair, I walked from the room. Ay, she may look venomous and deadly, but, for all that, she is beginning to see now that she has as much to fear from me as I can have from her. Murder! It has an ugly sound. But you don't talk of murdering a snake or of murdering a tiger. Let her have a care now.

May 5. I met Agatha and her mother at the station at eleven o'clock. She is looking so bright, so happy, so beautiful. And she was so overjoyed to see me. What have I done to deserve such love? I went back home with them, and we lunched together. All the troubles seem in a moment to have been shredded back from my life. She tells me that I am looking pale and worried and ill. The dear child puts it down to my loneliness and the perfunctory attentions of a housekeeper. I pray that she may never know the truth! May the shadow, if shadow there must be, lie ever black across my life and leave hers in the sunshine. I have just come back from them, feeling a new man. With her by my side I think that I could show a bold face to any thing which life might send.

5 P. M. Now, let me try to be accurate. Let me try to say exactly how it occurred. It is fresh in my mind, and I can set it down correctly, though it is not likely that the time will ever come when I shall forget the doings of to-day.

I had returned from the Mardens' after lunch, and was cutting some microscopic sections in my freezing microtome, when in an instant I lost consciousness in the sudden hateful fashion which has become only too familiar to me of late.

When my senses came back to me I was sitting in a small chamber, very different from the one in which I had been working. It was cosey and bright, with chintz-covered settees, colored hangings, and a thousand pretty little trifles upon the wall. A small ornamental clock ticked in front of me, and the hands pointed to half-past three. It was all quite familiar to me, and yet I stared about for a moment in a half-dazed way until my eyes fell upon a cabinet photograph of myself upon the top of the piano. On the other side stood one of Mrs. Marden. Then, of course, I remembered where I was. It was Agatha's boudoir.

But how came I there, and what did I want? A horrible sinking came to my heart. Had I been sent here on some devilish errand? Had that errand already been done? Surely it must; otherwise, why should I be allowed to come back to consciousness? Oh, the agony of that moment! What had I done? I sprang to my feet in my despair, and as I did so a small glass bottle fell from my knees on to the carpet.

It was unbroken, and I picked it up. Outside was written "Sulphuric Acid. Fort." When I drew the round glass stopper, a thick fume rose slowly up, and a pungent, choking smell pervaded the room. I recognized it as one which I kept for chemical testing in my chambers. But why had I brought a bottle of vitriol into Agatha's chamber? Was it not this thick, reeking liquid with which jealous women had been known to mar the beauty of their rivals? My heart stood still as I held the bottle to the light. Thank God, it was full! No mischief had been done as yet. But had Agatha come in a minute sooner, was it not certain that the hellish parasite within me would have dashed the stuff into her—— Ah, it will not bear to be thought of! But it must have been for that. Why else should I have brought it? At the thought of what I might have done my worn nerves broke down, and I sat shivering and twitching, the pitiable wreck of a man.

It was the sound of Agatha's voice and the rustle of her dress which restored me. I looked up, and saw her blue eyes, so full of tenderness and pity, gazing down at me.

"We must take you away to the country, Austin," she said. "You want rest and quiet. You look wretchedly ill."

"Oh, it is nothing!" said I, trying to smile. "It was only a momentary weakness. I am all right again now."

"I am so sorry to keep you waiting. Poor boy, you must have been here quite half an hour! The vicar was in the drawing-room, and, as I knew that you did not care for him, I thought it better that Jane should show you up here. I thought the man would never go!"

"Thank God he stayed! Thank God he stayed!" I cried hysterically.

"Why, what is the matter with you, Austin?" she asked, holding my arm as I staggered up from the chair. "Why are you glad that the vicar stayed? And what is this little bottle in your hand?"

"Nothing," I cried, thrusting it into my pocket. "But I must go. I have something important to do."

"How stern you look, Austin! I have never seen your face like that. You are angry?"

"Yes, I am angry."

"But not with me?"

"No, no, my darling! You would not understand."

"But you have not told me why you came."

"I came to ask you whether you would always love me—no matter what I did, or what shadow might fall on my name. Would you believe in me and trust me however black appearances might be against me?"

"You know that I would, Austin."

"Yes, I know that you would. What I do I shall do for you. I am driven to it. There is no other way out, my darling!" I kissed her and rushed from the room.

The time for indecision was at an end. As long as the creature threatened my own prospects and my honor there might be a question as to what I should do. But now, when Agatha—my innocent Agatha—was endangered, my duty lay before me like a turnpike road. I had no weapon, but I never paused for that. What weapon should I need, when I felt every muscle quivering with the strength of a frenzied man? I ran through the streets, so set upon what I had to do that I was only dimly conscious of the faces of friends whom I met—dimly conscious also that Professor Wilson met me, running with equal precipitance in the opposite direction. Breathless but resolute I reached the house and rang the bell. A white cheeked maid opened the door, and turned whiter yet when she saw the face that looked in at her.

"Show me up at once to Miss Penclosa," I demanded.

"Sir," she gasped, "Miss Penclosa died this afternoon at half-past three!"

THE END