116 SIRKS, THE COLOURFACTORS OF THE SEEDCOAT IN PHASEOLUS 
Both types lacking the D-factor (III and VI) are absent; while 
the other types come very near to the proportions, that are expec- 
ted according to the 9:3:3:1- scheme of segregation. In a total 
number of 345 this expectation would be 1941/,6 : 6411/16 : 6411/6 : 
219/16; the numbers observed were 186: 78 : 68 : 13. The division 
into groups I a and I b, II a and II b however is here somewhat 
deviating from the expectation; the difficulty of discerning these 
types will be cause of this deviation. 
The genotypic formula of the greybrown beans, called „Rotjes”, 
may thus be written in keeping with the results of the previous 
cross, as gg D D L L; that of the gellow-brown race ,,Bruine’ is, 
here also G G D D 11. The reddish brown hybrid is a dihete- 
rozygote Gg DDLI1, and the Fo-generation segregates into 
CDS GT DI see eel seb, 
In addition to these families, the segregation of which is enti- 
rely in harmony with the theoretical suppositions, in a culture of 
yellow-brown beans an individual was found with grey-brown 
seedcoats; its posterity (family 1027) showed a segregation into 
4 individuals of type II and 2 of type V. It may be supposed that 
the mother of this spontaneously born hybrid was a Gg DDI1I- 
heterozygote, that has given with ag $ D D L L-father an F;-in- 
dividual of the genotypic constitution $ $ D D L |. The mother- 
plant had been lost and thereby its posterity could not be grown; 
a decision about its heterozygous nature being thus impossible. 
6. OFFSPRING OF OTHER ABNORMAL PLANTS, FOUND. IN „ROTJES”. 
Some other plants with abnormally coloured seedcoats, found in 
cultures of the race ,,Rotjes,” gave as descendants four families, 
showing a segregation more or less parallel to those of the previ- 
ous crosses. One of them had grey-brown seedcoats without the 
brown navelring, while the three others had reddish brown seed- 
coats. The segregations could be classified in the same groups 
as in the preceding cases: 
(Cf Table. page 117.) 
The motherplant of family 992 with ¢ ¢ d d L 1 as genotypic 
formula took thus its origin from two gametes 8 d L and g d 1, 
either by spontaneous crossing of a phaenotypically identical 
ggd d L L with-a lemoncoloured (8 g d d 1 1) father, or as off- 
