. Evolution and animal life; an elementary discussion of facts, processes, laws and theories relating to the life and evolution of animals . is worthy of consideration byevery lover of truth.—St. Paul Despatch. D. APPLETON AND COMPANY, NEW YORK. BOSTON. CHICAGO. t. B. L LIBRARY COPYRIGHT. 1907, BYD. APPLETON AND COMPANY Published September, 1907 PREFATORY NOTE IN the present volume the writers have tried to give a lucidelementary account, in limited space, of the processes of evo-lution as they are so far understood. We have turned to ani-mals for illustrative purposes, nearly to the
. Evolution and animal life; an elementary discussion of facts, processes, laws and theories relating to the life and evolution of animals . is worthy of consideration byevery lover of truth.—St. Paul Despatch. D. APPLETON AND COMPANY, NEW YORK. BOSTON. CHICAGO. t. B. L LIBRARY COPYRIGHT. 1907, BYD. APPLETON AND COMPANY Published September, 1907 PREFATORY NOTE IN the present volume the writers have tried to give a lucidelementary account, in limited space, of the processes of evo-lution as they are so far understood. We have turned to ani-mals for illustrative purposes, nearly to the exclusion of refer-ences to plants, simply because both authors are zoologistsand have made use of the facts most familiar to them. The book is composed primarily of the substance of a univer-sity course of elementary lectures delivered jointly by theauthors each year to students representing all lines of collegework. This fact, and the desirable limiting of the book to aconvenient size for the general reader and student, account forthe extremely laconic treatment of various important mootpoints concerning the evolution mechanism, and for the omissionof certain discussions which otherwise might well have beenincluded. But on the whole the authors feel that the in
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