Arizona Agricultirai. Expkrimi-xt Station 481 



to be ])iii-c' Turkey grains. All the thirty-one grains were as hard 

 as the liard parent, no signs of xenia being apparent. The texture 

 of the more than eight thousand seeds which grew on the 31Fi 

 plants was mostly of the diffuse type (soft), with a few grains 

 almost as hard as the grains of the hard parent; but the diffuse 

 grains of these first generation plants were distinctly harder than 

 the diffuse grains of the soft parent. No selections were made 

 in this generation on the basis of texture, the progeny of each F, 

 plant being planted separately. The main object in making the 

 cross was to study the segregation oi these two types of texture in 

 the second generation and to test them in the third and succeeding 

 generations. However, selections have been made and planted 

 for the purpose of testing the effect of the selection of hard and 

 soft grains from the first generation plants. 



For the second plant generation studies, 4581 plants were 

 grown to maturity, and the classification of the grain of these 

 plants according to texture was as follows : 

 983 plants having all hard grains; 

 2285 plants having hard and soft grains; 

 1313 plants having all soft grains. 

 A more desirable classification would have resulted if it had 

 been possible definitely to separate the grains in the hard- and 

 soft-grained plants into the two types used, but this was impossible 

 on account of the almost insensible gradations in passing from one 

 extreme to the other. This classification gives the ratio 0.859: 

 1.995:1.1-16, which rather distantly approaches the 1:2:1 ratio. In 

 testing this classification in the third generation, the following 

 selections were grown : 



Three hundred and six plants, grown from seeds of Fj plants 

 having all hard seeds, gave 301 plants having seeds all hard, and 

 5 plants having seeds all intermediate; 476 plants, grown from 

 seeds of F,, plants having all soft seeds, gave 476 plants all soft; 

 • 143 plants grown from hard seeds selected from F2 plants having 

 both hard and soft seeds gave : 



131 plants having all hard seeds; 

 4 plants having all soft seeds ; 

 3 plants having hard and intermediate seeds ; 

 3 plants having hard and soft seeds; 

 1 plant having intermediate seeds ; 

 1 plant having soft and intermediate seeds. 

 Eighty-two plants grown from soft seeds selected from F. 

 plants having both hard and soft seeds gave: 



