



7 



THE STUDY OF / 

 ANIMAL LIFE 



BY J. ARTHUR THOMSON, M.A., LL.D. 



REGIUS PROFESSOR OF NATURAL HISTORY IN THE UNIVERSITY OF ABERDEEN J 



AUTHOR OF "HEREDITY," "THE BIOLOGY OF THE SEASONS," 



"THE WONDER OF LIFE," ETC. ; 



JOINT AUTHOR OF "THE EVOLUTION OF SEX," "EVOLUTION," " SEX," ETC. 



WITH ILLUSTRATIONS 





REVISED EDITION 



NEW YORK 



CHARLES SCRIBNER'S SONS 



597-599 FIFTH AVENUE 



1917 



