No. 574] 



INHERITANCE 



585 



interest to learn whether predictions were still possible. 



For the purpose of making comparisons easy, the 

 original diagram representing the second xenia genera- 

 tion is here repeated. (See Fig. 1.) The meaning of the 

 symbols is as follows: 8 is the factor for sweet, and X the 

 factor for waxy. When both S and X are present the seed 

 is expected to be horny. Small letters indicate the absence 

 or latency of the factors. 





5X 



5x 



aX 



sx 







Sx 



sX 



sx 



SX 





_g—*a JIMMY 





5X 





* SK 





7 J< 



a 



sx 



5* 



o NOM 

 Ox 



Ox 



o NOffif 

 Ox 



q MEET 

 Ox 





s SK 



" 5* 



" aX 



IE 



SX 











JT 





" SK 



Mm 



sx 



" a 



SWEET 



sx 



" JC 



ax 



/<5 



SX 



sx 



Since in both sweet and waxy the alternative factor 

 necessary to produce horny is assumed to be lacking, the 

 gametes produced by sweet varieties are represented by 

 Sx and the gametes produced by varieties with waxy endo- 

 sperm by sX. The synthetic horny produced by crossing 



