94 The Third and Fourth Generation 



wheat the coat color is red. When crossed with 

 the white-coated wheat the proportion of F^ 

 offspring is 62 red of varied shades and i 

 white. Evidently there are three factors 



producing red in this case, and the possible 

 shades of red are very numerous in this F^ 

 generation. 



Davenport believes that his study of crosses 

 between whites and negroes shows with a fair 

 degree of probabihty that the full-blooded 

 African negro has two factors for black in his 



