VOL. XLVIII, NO. 566 



FEBRUARY, 1914 



THE 



AMERICAN 

 NATURALIST 



A MONTHLY JOURNAL 

 Devoted to the Advancement of the Biological Science! with 



Special Reference to the Factors of Evolution 



THE SCIENCE PEESS 

 LANCASTER, PA. GARRISON, N. T. 



HEW YORK: SUB-STATION M 



