DARWIN, AND AFTER DARWIN 



AM EXPOSITION OF THE DARWINIAN THEORY 



AND A DISCUSSION OF 

 POST-DARWINIAN QUESTIONS 



BY THE LATE 



GEORGE JOHN ROMANES, M.A., LL.D., F.R.S. 



Honorary Fellow of Gon-ville and Caius College, Cambridge 



III 



POST-DARWINIAN QUESTIONS 



ISOLATION 

 AND PHYSIOLOGICAL SELECTION 



Chicago 



THE OPEN COURT PUBLISHING COMPANY 



1897 



93423 



