VOL. XLVIII, NO. 572 



AUGUST, 1914 



THE 



AMERICAN 

 NATURALIST 



A MONTHLY JOURNAL 

 Devoted to the Advancement of the Biological Science! 1 

 Special Reference to the Factors of Evolution 



nmals and Birds. 



THE SCIENCE PRESS 

 LANCASTER, PA. GARRISON, H. T, 



NEW YORK : SUB-STATION 84 



