701. XLVIII, NO. S70 



THE 



AMERICAN 

 NATURALIST 



A MONTHLY JOURNAL 

 Devoted to the Advancement of the Biological Science! with 

 Special Reference to the Factors of Evolution 



CONTENTS 



Species-building by Hybridization and Mutation. Professor Joh 



Heredity of Bristles in the Common Greenbottle Fly — A Study of Fs 



governing Distribution. Phineas W. Whiting 

 Physiological Correlations and Climatic Reactions in Alfalfa Breeding. 



P. Pekbmak ---------- 



ByX - - - 



ukage and Misleading Tei 



Shorter Articles and Discussion: Nabours's ? 1 ^ n ho ^^* Ea |^^^^' 



THE SCIENCE PRESS 

 LANCASTER, PA. GARRISON, N. T. 



NEW YORK : SUB-STATION 84 



