152 INBEEEDING AND OUTBEEEDING 



100 



75 



SO 



25 



Growth Curves of 

 Two Inbred Stra-ins 

 of Maize and Their 

 and F, Hybrids. 



30 40 50 60 70 80 



number of Bays from Planting 



90 



100 



FzG. 33. — Graphs showing growth curves of two inbred strains of maize and their first 

 and second generation hybrids. 



