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AN EXPOSITION OF THE
THEORY OF NATURAL SELECTION
WITH SOME OF ITS APPLICATIONS
ALFRED RUSSEL WALLACE
LL.D., F.L.S., ETC.
WITH A PORTRAIT OF THE AUTHOR. MAP AND ILLUSTRATIONS
NEW YORK: THE MACMILLAN COMPANY
All rights reserved
PREFACE TO THIRD EDITION
In preparing this edition I have corrected many small errors pointed out by my various correspondents, and have also added a considerable amount of new matter embodying important researches which have been made during the last twelve years,
and which serve to throw light on many obscure or disputed questions.
In order to avoid the inconvenience of altering the pagination of the greater portion of the volume and thus rendering it difficult to find passages which have been referred to by their pages in the first edition, most of the new matter is added in the form of Appendices to Chapters V, VIII, X, XII, and XIV, and the additional pages have been lettered instead of being consecutively numbered.
I have to thank my various correspondents for the notes and corrections they have so kindly sent me. Most of them are referred to by name in the text; but I have especially to thank Mr. Th. D. A. Cockerell and Mr. E. B. Titchener for a large number of valuable corrections and suggestions. I may
also state that several of the more difficult questions with which this volume deals have been more fully treated in five chapters on The Theory of Evolution in my recently published Studies Scientific and Social.