120 SIRKS, THE COLOURFACTORS OF THE SEEDCOAT IN PHASEOLUS 
BB and Bb-individuals, that was observed by KOOIMAN also among 
the yellowbrown beans, could not be constated in my materials. 
If we indicate in his lines the groundfactor for pigmentation as A, 
and if AA-plants without any other factor have white seedcoats, 
this complicated cross may be very well presented in a scheme 
of factorial constitutions. The formula of the Citroen-race may so, 
corresponding to thelsuppositions given above about the cryptomeric 
state of factor G, be written as AABBGGkkdd, that of the 
Kievits-race as AAbbggKKDD and the resulting F,-generation 
will thus be AABbGgKkDd, a tetrahybrid that forms 16 
different types of gametes: ABGKD, ABGKd, ABGKkD, ABg KD, 
AbGKD, ABGkd, ABgKd, AbGKd, ABgkD, AbGkD, 
A'ibgKD, ABgkd, AbGkd, AbgKd, AbgkD, Abgkd. 
Consequently the Fo generation consists of 256 combinations. 
Supposed, that the factors G, K and D are entirely dominant, 
while the Bb-individuals can be discerned from the B B-plants 
only if the other factors are miSsing, and that the K-, as also the 
G-factor remains invisible, if Dis absent, the following groups may 
be found among these 256 combinations: 
27 BBGK D F;-type I 3 BBGkd lemoncoloured V 
54 BbGKD F;-type I 6 BbGkd lemonmarbled VI 
27 b bGKD F;-type I 3 bb Gkd white VII 
9 BBGK d lemoncoloured V 3 BBgKd lemoncoloured V 
18 Bb GK d lemon-marbled VI 6 BbgKd lemonmarbled VI 
9 bbGKd white VII 3 bbgKd white VII. 
9 BBGKD yellowbrown II 3 BBgkD wagenaar III 
18 BbGkD yellowbrown II 6 BbgkD wagenaar III 
9 bbGk D yellowbrown II 3 bbgkD white with brown 
navelring VIII 
9 BBSKD kievits IV 1 BBgkd lemoncoloured V 
18 BbgKD kievits IV 2 Bb gkd lemonmarbled VI 
9 bbgKD kievits IV 1 bb gkd white VII 
In a total of 256 individuals of the Fo-generation there are 108 
