LOUIS CLARK VANUXEM FOUNDATION 



A CRITIQUE 



OF THE 



THEORY OF EVOLUTION 



BY 



THOMAS HUNT MORGAN 



PROFESSOR OK KXPEKIMKNTAI. ZOOI.OGT IN 

 COLUMBIA UNIVERSITY 



LECTURES DELIVERED AT PRINCETON UNIVERSITY 

 FEBRUARY 24, MARCH 1, 8, 15, 1916 



PRINCETON UNIVERSITY PRESS 

 PRINCETON 



LONDON: HUMPHREY MILFORD 

 OXFORD UNIVERSITY PRESS 



1916 i^^ y 



