No. 507] 



I \ 11 1:1' . 



J DIES IN PISUM 539 



determiner for green pigment was not able to produce as 

 dark a green in F 2 green segregates as in peas of the 

 green cotyledon parent race. This is true undoubtedly 

 in some few cases, but in still others, Hurst ( 1904), Darbi- 

 shire (1913) and myself have been unable to find any dis- 

 tinction in shading by comparing the segregates with the 

 grandparental seeds of both colors. In those cases where 

 there has been found a difference, the observers probably 

 failed to take into account all the environmental factors. 



New Data 



In my own investigations 5 on the heredity of cotyledon 

 color, the F 1 and F 2 generations from over 79 crosses in- 

 volving combinations of 40 varieties and species of Pisum 

 have given results similar to those secured by other work- 

 ers except in the case of crosses involving a variety of 

 German pea, " Goldkonig, ' ' obtained from Haage & 

 Schmidt. The data for most of these crosses are given 

 in Tables Ilia, lllb, lllc. 



