VOL. XI.V, HO. 531 



MARCH, 1911 



THE 



AMERICAN 

 NATURALIST 



A MONTHLY JOURNAL 

 Devoted to the Advancement of the Biological Science! with 

 Special Reference to the Factors of Evolution 



CONTENTS 



J 3 



L The Genotype Conception of Heredity. Professor W. Johanksen - 

 II. The Genotype Hypothesis and Hybridization. Professor E. M. East - - 

 ni. Notes on Gundlachia and AncylnB. Dr. William Healey Dall 

 IV. Notes and Literature : Mimicry, Dr. Frank E. Uttz - - - - 



THE SCIENCE PRESS 

 LANCASTER, PA. GARRISON, N. J. 



NEW YORK : SUB-STATION 84 



