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and Revised, with Portrait.

Species and Varieties:

Their Origin by Mutation
By Hugo de Vries

Professor of Botany in the University of Amsterdam

Edited by Daniel Trembly Mac Dougal, Assistant
Director of the New York Botanical Garden
xxiii+830 pages

HE belief has prevailed for more than half a century that species are changed into new types very slowly and that thousands of years were necessary for the development of a new type of animal or plant. After twenty years of arduous investigation Professor de Vries has announced that he has found that new species originated suddenly by jumps, or by "mutations," and in conjunction with this discovery he offers an explanation of the qualities of living organisms on the basis of the conception of unit-characters. Important modifications are also proposed as to the conceptions of species and varieties as well as of variability, inheritance, atavism, selection and descent in general.

The announcement of the results in question has excited more interest among naturalists than any publication since the appearance of Darwin's Origin of Species, and marks the beginning of a new epoch in the history of evolution. Professor de Vries was invited to deliver a series of lectures upon the subject at the University of California during the summer of 1904, and these lectures are offered to a public now thoroughly interested in modern ideas of evolution.

The contents of the book include a readable and orderly recital of the facts and details which furnish the basis for the mutation-theory of the origin of species. All of the more important phases of heredity and descent come in for a clarifying treatment that renders the volume extremely readable to the amateur as well as to the trained biologist. The more reliable historical data are cited and

the results obtained by Professor de Vries in the Botanical Garden at Amsterdam during twenty years of observations are described.

Not the least important service rendered by Professor de Vries in the preparation of these lectures consists in the indication of definite specific problems that need investigation, many of which may be profitably taken up by anyone in a small garden. He has rescued the subject of evolution from the thrall of polemics and brought it once more within reach of the great mass of naturalists, any one of whom may reasonably hope to contribute something to its advancement by orderly observations.

The text of the lectures has been revised and rendered into a form suitable for permanent record by Dr. D. T. MacDougal who has been engaged in researches upon the subject for several years, and who has furnished substantial proof of the mutation theory of the origin of species by his experimental investigations carried on in the New York Botanical Gardens.

Price, postpaid $5.00 (21s.) net. xxiii+830 pages, 8 vo., cloth, gilt top

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A Sketch of his life and an
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CHRISTIANITY AND PATRIOTISM With pertinent extracts from other essays

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TABLE OF CONTENTS

PREFATORY NOTE.-Christianity and Patriotism, Translated by Paul Borger. Overthrow of Hell and its Restoration, Translated by V. Tchertkoff. Appeal to the Clergy. Translated by Aylmer Maude. Answer to the Riddle of Life. Translated by Ernest H. Crosby. Views on the Russo-Japanese War, Translated for the London Times. Epilogue, Patriotism and Chauvinism, Paul Carus.

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