HEREDITY 



BY J. ARTHUR THOMSON, M.A. 



Regius Professor of Natural History in the University 

 of Aberdeen 



THE 

 HER- 



F.ERT SPENCER," "DARWINISM AND HUMAN LIFE," 



"THE BIOLOGY OF THE SEASONS," "INTRODUCTION 



TO SCIENCE," ETC.; JOINT-AUTHOR OF "THK 



EVOLUTION OF SEX," "EVOLUTION," ETC. 



SECOND EDITION 



LONDON 



JOHN MURRAY, ALBEMARLE STREET, W. 



1912 



