LUTHER BURBANK 



mines to some extent the readiness with which the 

 grain is shelled out in the thresher. 



The interest in the different types of glumes as 

 to smoothness and of color, in the present connec- 

 tion, centers about the fact that neither parent 

 showed dominance in the first generation of the 

 hyhrid, the individual hybrids differing indefi- 

 nitely. 



In some cases there would be almost pure 

 dominance; in others a blend of the characters. 

 But in the second generation the characters were 

 segregated just as if they had shown the typical 

 phenomena of dominance and recessiveness in the 

 first generation. 



The third group of characters, in which there 

 was uniform blending in the first generation of 

 hybrids, with no tendency whatever to manifesta- 

 tion of dominance of one character over the other, 

 found representation in the following pairs of unit 

 characters: (1) lax ears versus tense ears; (2) 

 large glumes versus small glumes; (3) long grains 

 versus short grains; (4) early habit of ripening 

 versus late habit of ripening. 



As to each of these pairs of characters, the 

 hybrids of the first generation were intermediate 

 between the parents. For example, if a wheat 

 having long grains was crossed with one having 

 short grains, the hybrid bore wheat neither long 



[64] 



