134 SIRKS, THE COLOURFACTORS OF THE SEEDCOAT IN PHASEOLUS 
II was grey-marbled upon white; III greyish black selfcoloured ; 
IV grey selfcoloured, V H-type (white with brown navelring); VI 
Wagenaar-type, VII lemoncoloured and VIII white. The frequencies 
in Fo were as follows: 

| 
| 
ope I | oe bas VII | VIII | Total 
1000 Spont. hybr. from Citroen ER 4 | 5 | 2 15 | 1 | 1 | x | 29 
If here the same blackfactor Z has played a röle, as in the 
previous crosses, one might conclude, that it gives the phaenotype of 
bright black only when the factor for yellowbrown, G, is also 
present; if this factor is absent, the Z-factor will give only a greyish- 
black colour. Further conclusions may be reserved for the future. 
b. PHASEOLUS MULTIFLORUS. 
The scarletrunnerbean is in many respects less favourable for a 
genotypic analysis of its varieties than the races of the common 
gardenbean; first in individual cultures the plant requires a stalk 
and a square metre each, and second the cross-fertilization in this 
species is certainly more important than in the other, so that iso- 
lation of the inflorescences seems to be a necessary condition for 
obtaining exact results. This isolation however is very difficult and 
has given in my researches in a few cases only some seeds, but 
never more than four in a whole inflorescence. Obtaining of reliable 
numbers in these researches is thus much less probable than in 
those concerning Phaseolus vulgaris. 
‚ The number of varieties in this species is only afew; the most 
common form with red flowers has blackmarbled seeds upon a 
light-violet ground (pl. III fig. 2); besides there are redflowering 
forms with black marbling and a darkviolet groundcolour (fig. 3); 
redflowering ones with lisht-violet colour and here and there little 
black spots (fig. 4). redflowering plants with shining black seeds 
(fig. 5), a red-and-white flowering (socalled Papillon) type with 
yellow-white and brown-marbled seeds (fig. 6), red-and-white flowering 
with yellowish-white and grey-marbled seeds (fig. 7) and last a white- 
flowering race with pure white seeds (fig. 1), which race is used 
On a great scale as vegetable in our country. The redflowering 
