100 



Growth Curves of 

 Two Inl)rod Strains 

 of Maize and Their 

 Pj^ and Fg Hybrids. 



o 



c 



00 



-i-t 



30 



40 



50 60 70 80 

 Mumber of Days from Planting 



Fig. 148. Graphs showing growth curves of two inl)ro<l strains of maize, P (1-7) and P (1-9), and of 

 their Fi and F2 hybrids. Note that both Fi and F2 arc at all ages much taller than either inbred parent 

 race, but that Fj is considerably taller than F2, as the plants approach maturity. (After East and 

 Jones.) 



