124 sIRKS, THE COLOURFACTORS OF THE SEEDCOAT IN PHASEOLUS 
were theoretically expected, is a sufficient corroborative of the 
suppositions given above; the further details of types I and IV 
and the violet glow in types IIb and IIIb are, here also, still too 
complicated for allowing conclusions on their genotypic nature. 
9. Cross oF RoTIEs X KIEVITS. 
In a culture of the Rotjes-race two plants were found, the seeds 
of which were different from those of the other plants by a marbling 
of the grey-brown colour, and besides by a blueviolet marbling 
that covered here and there the greybrown groundcolour. Artificial 
hybrids between the Rotjes-race and Kievits were not available so 
that a decision could not be founded upon the phaenotype of the 
F,-individuals, but the segregation of both Fo-families made the 
paternity of a redviolet-marbled individual (like the Kievits-race) 
very probable; in only one of them however the Kievits-race as 
such seems to have been the pollenparent, in the other a race 
with reddish-violet striped beans, as had the striped bushbean of 
Prague, used by TJEBBES and KOOIMAN in their crosses. 
The Fo-posterity of the firstnamed spontaneous hybrid segregated 
into five well-discernable types, of which three again could be 
divided in subtypes: type I corresponded in phaenotype very well 
to the F,, some individuals however being darker of colouring (type Ia) 
than the others (Ib); type II was phaenotypically the same as the 
reddish-violet-marbled Kievits-race, the colour however being changed 
into blue-violet; here also two types of intensity could be discer- 
ned: one darker (Ila, plate II fig. 11) and the other, IIb, with a 
lighter and more matblue. The third type was apparently the same 
as the Kievits-race, and could again be divided into five subtypes 
(IIla—e) according to the intensities of colouring; IV was identical 
with the grey-brown Rotjes-race, while V had the same phaenotype 
as the Wagenaar-race. The distribution of the individuals among 
these types, was the following: 


— 
V V Total 
| 
Ia Ib Ia IIb Illa IIIb Bake 
PARA 
3423 NT 8 ee 5 || 67 
| | LAS | 
26 
Type 
| 
1010 Spont. hybr. 
from Rotjes 
| 
| 
| | 
15 12 915 67 






