588 



THE AMERICAN NATURALIST [Vol.L 



studies and all gave similar results. With these facts 

 before us, there can be no denying the validity of Men- 

 del's law as regards inheritance of cotyledon color in 

 Pisum. The criticism has sometimes been made that the 

 F 2 segregate yellows and greens were a little less green 

 and a little less yellow owing to the association of the 

 unit factor materials of the two pigments in the Fj genera- 

 tion. In other words, segregation was not complete ; the 



Pl-4 X P39-3)-l 

 P21-1 X Pl-1)-1 

 P23-5 X P39-3)-l 

 P26-1 X Pl-1)-1 

 P26-1 X Pl-l)-2 

 P26-1 X Pl-l)-3 

 P26-1 X Pl-l)-4 

 P27-1 X Pl-1)-1 

 P28-1 X Pl-1)-1 



P29-1 X P35-7)- 

 P32-1 X P35-2)- 

 P34-2 X P35-7)- 

 P35-3 X Pl-4)-l 



P39-1 X P32-1)- 

 P40-1 X P59-1)- 

 X P59-1)- 



P62-1 X P41-3)-l 

 P62-1 X P41-3)-2 

 P65-1 X P41-3)-l 

 P72-1 X P41-5)-l 

 P72-1 X P41-5)-2 



:ically expected 



