GREENLAND ICEFIELDS, AND LIFE IN THE NORTH ATLANTIC. With a New Discussion of the Causes of the Ice Age. By G. FREDERICK WRIGHT, D.D., LL.D., F.G.S.A., Author of "The Ice Age in North America," "Man and the Glacial Period," etc., and WARREN UPHAM, A.M., F.G.S.A., late of the Geological Surveys of New Hampshire, Minnesota, and the United States. With numerous Maps and Illustrations. 12mo. Cloth, $2.00.

THE ICE AGE IN NORTH AMERICA, and its Bearings upon the Antiquity of Man. With an Appendix on "The Probable Cause of Glaciation," by WARREN UPHAM, F.G.S.A., Assistant on the Geological Surveys of New Hampshire, Minnesota, and the United States. New and enlarged edition. With 150 Maps and Illustrations. 8vo, 625 pages, and Index. Cloth, $5.00.

MAN AND THE GLACIAL PERIOD. International Scientific Series. With numerous Illustrations. 12mo. Cloth, $1.75.

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VARIOUS FRAGMENTS, 12mo. Cloth, $1.25.

Along with a considerable variety of other matter, these "Fragments" include a number of replies to criticisms, among which will be found some of the best specimens of Mr. Spencer's controversial writings, notably his letter to the London Athenaeum on Professor Huxley's famous address on Evolutionary Ethics. His views on copyright, national and international, "Social Evolution and Social Duty," and "Anglo-American Arbitration," also form a part of the contents.

EDUCATION: Intellectual, Moral, and Physical. 12mo. Paper, 50 cents; cloth, $1.25.

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THE INADEQUACY OF "NATURAL SELECTION." 12mo. Paper, 30 cents.

This essay, in which Professor Weismann's theories are criticised, is reprinted from the Contemporary Review, and comprises a forcible presentation of Mr. Spencer's views upon the general subject indicated in the title.

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PIONEERS OF SCIENCE IN AMERICA. Sketches of their Lives and Scientific Work. Edited and revised by WILLIAM JAY YOUMANS, M.D. With Portraits. 8vo, Cloth, $4.00.

Impelled solely by an enthusiastic love of Nature, and neither asking nor receiving outside aid, these early workers opened the way and initiated the movement through which American science has reached its present commanding position. This book gives some account of these men, their early struggles, their scientific labors, and, whenever possible, something of their personal characteristics. This information, often very difficult to obtain, has been collected from a great variety of sources, with the utmost care to secure accuracy. It is presented in a series of sketches, some fifty in all, each with a single exception accompanied with a well-authenticated portrait.

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PIONEERS OF EVOLUTION, from Thales to Huxley. By EDWARD CLODD, President of the Folk-Lore Society; Author of "The Story of Creation," "The Story of 'Primitive' Man," etc. With Portraits. 12mo. Cloth. $1.50.

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"This is a book which was needed.... Altogether, the book could hardly be better done. It is luminous, lucid, orderly, and temperate. Above all, it is entirely free from personal partisanship. Each chief actor is sympathetically treated, and friendship is seldom or never allowed to overweight sound judgment."—London Academy.

"We can assure the reader that he will find in this work a very useful guide to the lives and labors of leading evolutionists of the past and present. Especially serviceable is the account of Mr. Herbert Spencer and his share in rediscovering evolution, and illustrating its relations to the whole field of human knowledge. His forcible style and wealth of metaphor make all that Mr. Clodd writes arrestive and interesting."—London Literary World.

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EVOLUTION OF MAN AND CHRISTIANITY. New edition. By the Rev. HOWARD MACQUEARY. With a new Preface, in which the Author answers his Critics, and with some important Additions. 12mo. Cloth, $1.75.

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HISTORY OF THE CONFLICT BETWEEN RELIGION AND SCIENCE. By Dr. JOHN WILLIAM DRAPER. 12mo. Cloth, $1.75.

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A CRITICAL HISTORY OF FREE THOUGHT IN REFERENCE TO THE CHRISTIAN RELIGION. By Rev. Canon ADAM STOREY FARRAR, D.D., F.R.S., etc. 12mo. Cloth, $2.00.

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CREATION OR EVOLUTION? A Philosophical Inquiry. By GEORGE TICKNOR CURTIS, 12mo. Cloth, $2.00.

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THE WARFARE OF SCIENCE WITH THEOLOGY. A History of the Warfare of Science with Theology in Christendom. By ANDREW D. WHITE, LL.D., late President and Professor of History at Cornell University. In two volumes. 8vo. Cloth, $5.00.

"The story of the struggle of searchers after truth with the organized forces of ignorance, bigotry, and superstition is the most inspiring chapter in the whole history of mankind. That story has never been better told than by the ex-President of Cornell University in these two volumes.... A wonderful story it is that he tells."—London Daily Chronicle.

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A NEW BOOK BY PROF. GROOS.

THE PLAY OF MAN. By KARL GROOS, Professor of Philosophy in the University of Basel, and author of "The Play of Animals." Translated, with the author's cooperation, by Elizabeth L. Baldwin, and edited, with a Preface and Appendix, by Prof. J. Mark Baldwin, of Princeton University. 12mo. Cloth, $1.50 net; postage, 12 cents additional.

The results of Professor Groos's original and acute investigations are of peculiar value to those who are interested in psychology and sociology, and they are of great importance to educators. He presents the anthropological aspects of the subject treated in his psychological study of the Play of Animals, which has already become a classic. Professor Groos, who agrees with the followers of Weismann, develops the great importance of the child's play as tending to strengthen his inheritance in the acquisition of adaptations to his environment. The influence of play on character, and its relation to education, are suggestively indicated. The playful manifestations affecting the child himself and those affecting his relations to others have been carefully classified, and the reader is led from the simpler exercises of the sensory apparatus through a variety of divisions to inner imitations and social play. The biological, aesthetic, ethical, and pedagogical standpoints receive much attention from the investigator. While this book is an illuminating contribution to scientific literature, it is of eminently practical value. Its illustrations and lessons will be studied and applied by educators, and the importance of this original presentation of a most fertile subject will be appreciated by parents as well as by those who are interested as general students of sociological and psychological themes.

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THE END