DARWIN, AND AFTER DARWIN 



AN 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 Fello-w of Gonville and Caius College, Cambridge 



III 



POST-DARWINIAN QUESTIONS 



ISOLATION 

 AND PHYSIOLOGICAL SELECTION 



CHICAGO AND LONDON 

 THE OPEN COURT PUBLISHING COMPANY 



- 1914 



