Heredity 



195 



FIG. 47. Three generations of hybrid wheat: A 1 = male parent, 

 A 2 = the hybrid, A 3 = female parent ; B 1-6 = the progeny of A 2 ; 

 C 1 = progeny of B 1, C 2-4 = progeny of B 2, C 5 = progeny of B 3, 

 C 6 and 7 = progeny of B 4, C 8-13 = progeny of B 5, C 14 and 15 

 = progeny of B 6. The results in the fourth generation, available 

 too late to include in the photograph, indicate that B 2 and B 3, 

 while not always separable on external appearances, are absolutely 

 different, the one being hybrid, the other pure. 



Little Club) ; and the middle one is the hybrid. The 

 second row shows the second generation, and .the third 

 row the third generation. Of the six types in the second 

 generation, the following points are important : Each 



