136 sIRKS, THE COLOURFACTORS OF THE SEEDCOAT IN PHASEOLUS 
Though these numerical proportions are not entirely proving, they 
seem to indicate the correctness of following conclusions: 
1. White is the recessive form, that is missing a groundfactor 
for pigment; 
2. Lightviolet-marbled plants do segregate white descendants; 
the monohybrid nature of this segregation, however, is uncertain 
(168 : 23); 
3. Darkviolet-marbling dominates lightviolet marbling; the diffe- 
rence is caused by only one factor (80: 25); 
4. The spotted type dominates the lightviolet marbling, as may 
be concluded from the segregation 63 spotted: 26 lightviolet marbled; 
5. Black is dominant over lightvioletmarbled, as also over white 
seedcoat; 204 blacks: 63 lightvioletmarbled; one of the segrega- 
tions seems to segregate into 12 black: 3 lightvioletmarbled: 1 
white, the other into 9:3: 4; 
6. Brownmarbling (Papillonpattern) is recessive to lightviolet 
marbling (27:7); besides an absolute linkage be mentioned between 
this pattern of the seedcoat and the red-and-white colour of the 
flower (these characteristics may also be considered as to be 
caused by one pleiotropic factor); 
7. The brown papillonpattern is dominant over the grey-white 
marbling (segregation 10: 3). 

