HOUWINK’S EXPER. CONC. THE ORIGIN OF SOME DOMESTIC ANIMALS 257 
a. the hen, of Mr. Houwink's crosses, which resembles a furcatus-hen 
most, has these markings to a still more considerable degree than 391.9 
‘and this hen 619.5 Pl. VII fig. I was obtained from a cross of Son- 
nerat-bankantam 276.8, an F, bird, with our F, cock from the 
cross bankantam X furcatus. 
b. the dark colour of the hens 391.1 and 604.4, especially of the latter, is 
evidently due to a factor for black, and, as we shall see, there is some 
evidence, that the black factor in our domestic poultry is derived from 
furcatus. 
Sonneratian influence is clearly seen in the median white stripes on 
the breast and the white shaftstripes on the back of all of the F3 hens, 
to agreater or smaller degree, and also in the submarginal black of the 
breast feathers of most of them. 
Of the F; hens which are still alive, 391.76 2 (Pl. IX fig. 10) has the 
comb, the ear lappets and the gular wattles red. Dorsally it resembles a 
silverpartridge, so that it certainly contains the silverfactor S; the end 
of the tail is black, the breast shows some cinnamon-colour, while the 
belly is almost white. The secondaries are partly crossbarred, partly 
pencilled, the legs willowy. 
391.7 (PL IX fig. 11) has very small gular wattles, which, like the 
comb and the earlappets, are red; the iris is almost white or more exact- 
ly avery pale yellow, in which respect it comes nearest to varius (furcatus). 
According to BEEBE namely, the iris of the hen of lafayetti is 
yellow, the one of the hen of bankiva, according to VORDERMAN, of the 
colour of burnt sienna, while BEEBE again describes the iris of the son- 
nerati hen as red to yellow and the one of the varius-hen as straw yellow. 
The results of the F3 generation confirm therefore the conclusions we deri- 
ved from the F, generation, as to the comparatively slight influence of the 
Sonnerat-ancestor in these crosses, with the exception of the silver-factor 
and revealed moreover an almost certain varius-influence in the conspicu- 
ous crossbarring of the secondaries of some of the hens, while the very dark 
coloring of some of them may, as well as the pale eye color, in some cases, 
be also due to a strain of varius-blood in our bankantams. 
The F, generation of the cross in which the Sonnerat-cock 
195.1 3 was used 
A F, was obtained from the cross 391.6 2 x 391.11 4; it got the 
registernumber 578. 
Genetica VI 17 
