HEREDITY 



By J. ARTHUR THOMSON, M.A. 



Regius Professor of Natural History in the Uni'versity 

 of Aberdeen 



AUTHOR OF "the STUDY OF ANIMAL LIFE," "THE 



SCIENCE OF LIFE," " OUTLINES OF ZOOLOGY," "THE 



PROGRESS OF SCIENCE," "HERBERT SPENCER," ETC. ; 



JOINT- AUTHOR OF "THE EVOLUTION OF SEX" 





WITH 4.g ILLUSTRA TIONS 



NEW YORK 



G. P. PUTNAM'S SONS 



LONDON 



JOHN MURRAY 



1908 



