VOL. X1VII, HO. 862 



OCTOBER, 1913 



THE 



AMERICAN 

 NATURALIST 



A MONTHLY JOURNAL 

 Devoted to the Advancement of the Biological Sciencei 

 Special Reference to the Factors of Evolution 



Analysis of the Problem of Inbreeding. 



The Variations In 1 



THE SCIENCE PRESS 

 LANCASTER, PA. GARRISON, V. T. 



HEW YORK : SUBSTATION 64 



