

DARWINISM TO-DAY 



A DISCUSSION OF PRESENT-DAY SCIENTIFIC CRITICISM 

 OF THE DARWINIAN SELECTION THEORIES, TO- 

 GETHER WITH A BRIEF ACCOUNT OF THE 

 PRINCIPAL OTHER PROPOSED AUXIL- 

 IARY AND ALTERNATIVE THEO- 

 RIES OF SPECIES-FORMING 



BY 



VERNON L. KELLOGG 



PROFESSOR IN LELAND STANFORD, JR., UNIVERSITY 



NEW YORK 



HENRY HOLT AND COMPANY 



1907 



