HOUWINK’S EXPER. CONC. THE ORIGIN OF SOME DOMESTIC ANIMALS 259 
account of the uncertainty as to the origin of the bankantams with 
which the experiment began. 
The F; generation of the cross in which the Sonnerat cock 195.1 3 was used. 
An F, was obtained from the cross 580.1 © x 578.1 &, it was num- 
bered 606. and consisted of 5 chicks. 
1921 
606.1 born June 10 1921 
606.2 KONE 
606.3 , » 101921 | all killed and eaten by a cat Aug. 9. 1921 
606.4 10 1921 
6065 , 021921 

Neither the junior nor the senior author has ever seen these chicks. 
Other crosses within this series of experiments were: 
a. bankantam 201.3 © crossed back with the F, cock 198.1 & with the 
very distinct sonneratian waxy spots. 
Two cocks were obtained from this cross: 271.1 4 and 271.2 &, 
both strongly resembling bankiva’s of which 271.1 & showed no 
trace of its Sonnerat-ancestry, except possibly the black median 
stripe of the hackles which, however, may also be due to a strain 
of varius blood in the bankantam, while 271.2 ¢ showed an indi- 
cation of Sonnerat-influence both in the simili-waxy spots at the 
tip of the wing-coverts, as in the circumstance that, at a point 
of the hackles where the second waxy spot of Sonnerat could be 
expected, the median black stripe is not black but brown. 
b. the F, hen 391.7 2 was crossed back with the F, cock 206.1 Sand 
gave a cock 623.2 & and a hen 632.4 © which were still alive at 
Mook in March 1923. 
The cock looked very much like its father, while the hen showed so- 
me Sonnerat-influence in the rather broad white shaftstripe of the 
feathers of the back, as well as in the submarginal stripes of the feathers 
on the ventral surface. 
Besides these series of experiments in which the descendants from 
the two Sonnerat cocks 195.1 g and 269.1 & were kept strictly apart, 
there are some animals which have both cocks in their ancestry. 
