Fig. 145, Two ears of maize self -fertilized for 

 six generations and between them an ear of 

 their Fi hybrid, (After East and Jones.) 



Fig. 146. Two plants of maize self-ferti- 

 lized for eleven generations, and be- 

 tween them, plants of their Fi hybrid 

 showing greatly increased size and pro" 

 ductiveness. 



Fig. 147. A field of maize showing remarkably uniform and vigorou^ plants representing a lirst gener- 

 ation cross between two inbred strains. (After Last and Jones.) 



