TOI. XLV, NO. 532 



APRIL, 1911 



THE 



AMERICAN 

 NATURALIST 



A MONTHLY JOURNAL 

 Devoted to the Advancement of the Biological Sciencei with 

 Special Reference to the Factors of Evolution 



. II. Dr. 



B. The Genotypea of Maize. Dr. Geoege Ha 



THE SCIENCE PRESS 

 LANCASTER, PA. GARRISON, N. T. 



NEW YORK : SUB-STATION 84 



