Fig. 145. Two ears of maii^e 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- 

 Jized 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 imiform and vigorous plants, representing a first gener- 

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



