VULGARIS L. AND IN PH. MULTIFLORUS WILLD. 107 
the first race was supposed to be FF BBss (F being the ground- 
factor for pigmentation, B giving the yellowish brown colour), that 
of the violet-striped bushbean of Prague would be FFBBSS: 
this S indicating a factor that prevents the brown colour in certain 
regions of the seedcoat from development and changes the remai- 
ning brown into violet. In later years (1921) the writers have 
changed their opinion concerning the functions of these factors: 
S would not influence B in the manner described above, but its 
presence alone results in the development of a violet colour, that 
is locally confined; these factors B, for the brown colour, and S 
for the violet stripes, show an absolute repulsion in the process 
of factorial segregation. Further TJEBBES and KooïMAN have founded 
the factors Z (black colouring), Bl (blue) and V (corrosive factor 
causing a marbling and colourdiluting, that may be realised as a 
constant racial character). 
The analysis of the posterity from a hybrid, spontaneousiy 
originated gave to me (1920) the possibility of concluding th. 
existence of the following characters: P the groundfactor for coloured 
seedcoat, that in lonely presence. develops a yellowish colour ; 
G the factor for yellowish-brown colour; L a factor for darkbrown; 
V a factor for violet colour, being hypostatic to the L-factor ; 
Gr a factor, that gives a grey glow in addition to the other colours, 
B a factor changing violet into blue, and S a factor for stripes, 
that restricts the blue, violet and grey colours into stripes. Some 
of these factors seemed to be linked somehow. 
In another paper concerning this subject, KOOrMAN (1920) has 
suggested the existence of still other factors in the seedcoats of 
Phaseolus vulgaris: A the groundfactor for colourdevelopment, 
Ba factor that gives a total colouring of the seedcoat, a small 
ring around the navel excepted, if presence of A makes a coöpera- 
tion possible; beans with both factors A and B are lemon-yellow. 
C is a factor that together with A colours the whole seedcoat, the 
navelring. included in a brownish colour, while D in presence of 
A and absence of B and C causes a brown colour of the navelring 
only, and an almost unobservable grey dotting on the remainder 
of the seedcoat. Besides these factors, others still are discovered 
by Kooiman: two factors that influence the intensity of the other 
colours: E intensifying the brown colours, and F that gives a 
