“VULGARIS L. AND IN PH. MULTIFLORUS WILLD. : 131 
red-brown (Rotjes)-plant. The segregation of white-seeded aa- 
plants results from the heterozygotic state of the A-factor; the 
D-factor, that is visible more or less in all coloured individuals, is 
missing entirely in these white-seeded descendants, so that no one 
individual of the so-called H-type has occured. Therefrom one 
might conclude to a linkage of very high degree between the 
factors A and D; all aa-plants were also dd, while all AA-plants, 
insofar one could discern it phaenotypically, possessed the coloured 
navelring D. The conclusion of the heterozygotic state of the G- 
factor might perhaps be met with some doubt, because of the 
segregation going not tarther than the yellow-brown type; the 
previous crosses however have led to the genotypic formula g 4 LL 
for beans of the grey-brown type (like the Rotjes-race) and the 
occurrence of such grey-brown descendants in these Fo-families 
can only be explained by supposing a heterzygotic state, of the 
G-factor. 
TSCHERMAK already had found a difference in proportions of 
colouriypes between the marbled beans and the selfcoloured ones; 
the numbers given above seem to show the same. Here also, as in 
TSCHERMAKS researches, the blackselfcoloured beans are too few 
in number in relation to the numbers of grey-brown and yellow- 
brown types; among the marbled groups these proportions seem 
to have been reversed. The further study of the F3-families will 
give more confirmed conclusions. 
125. Cross oF BRUINE X WITTE? 
Besides the black-yellow-brown marbled F;-plants, the posterities 
of which gave entirely parallel segregations, one plant, originated as 
spontaneous hybrid in a culture of ,,Bruine’ and showing the same 
phaenotype as the others, segregated in Fy in another way, espe- 
cially regarding the little number of white-seeded descendants, The 
distribution of its Fy-descendants among the same phaenotypes as in 
the previous crossings was found to be as follows: 


Type | I | II IL IV | v VI VII van | IX Total 
1023 Spont. hybrid from Bruine | 11 4 - — 8,207], | 3 | 40 

