154 LOTSY AND KUIPER, A PRELIM. STATEMENT OF THE RESULTS OF MR. 
grey brown (the same colour as the neckfeathers). In Fy too the crest 
colour was almost the same as that of the whole plumage, viz: white 
in white birds, dark goldbrown in Bankiva-coloured cocks, grey 
brown in Bankiva-coloured hens. 
But in the second cross Bankiva 220.8 © x Silky 446.1 4 in 
F; 9 birds of 18 had a black crest (3 7 6 2) there seemed to bea 
correlation between black crest and rose comb as only 3 of 
these black crested pullets (2—1) had a single comb. 
In the F, of the reciprocal cross, the cocks had a goldbrown 
crest with a black spot just behind the comb, or without this spot, 
the hens were black crested, with the exception of one hen 
(413.15) whose crestfeathers had the greybrown colour of those in 
the reciprocal cross (exp. 414). 
This crest-colour was one of the characters our first reciprocal 
crosses did not agree in. It seemed to give a confirmation of the 
results VON TSCHERMAK obtained. But look! In the following year we 
had in experiment 413 (Silky mother) one exception, (just as 
VON TSCHERMAK described, but exp. 630 gave no fewer than 9 
„exceptions”. This is a very good indication the differences VON 
TSCHERMAK found in his reciprocal crosses, were only a conse- 
quence of the heterozygous nature of the material he started with. 
Colour of the plumage. 
Our results agree with those of former experimenters in rela- 
tion to the colour of the plumage as a whole. 
In both F;'s the black-red-colour (Bankiva-colour) is dominant. 
Generally the pullets from the Silky-mother were remarkably darker 
than those from the Bankiva mother and this appears specially in 
the crest-colour. 
Only this difference proved to be inconstant when the crosses 
were repeated, as the darker plumage and the black crest seemed 
to be linked. 
In Fa no other colour than black-red and white came forth. 
Probably our Silky only missed the factor needed for the develop- 
ment of colour, but possessed kryptomere the factors for whole- 
colouring and black-red or partridge colour, characteristic for the 
Jungle-fowl. This agrees: perfectly with the experience of BATESON. 
His experiments have shown that the cross even between normally 
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