CEYLON JUNGLE FOWL. 163 
be drawn from such a small number as two, but the fact remains 
that they have not lived for even three weeks. Every poultry 
fancier, however, knows that it is a much harder thing to rear a 
single solitary chick than a brood of them. 
From the foregoing it is obvious that, while the sterility of 
these hybrids cannot be upheld, yet there is nevertheless a certain 
amount of ‘‘ relative sterility.” 
Whilst fully bearing in mind that these conclusions are only 
drawn from the doings of a single pair of hybrids, brother and 
sister, it must be stated that-the other pair, or rather a cock and 
two hens, of hybrids in Mr. Bhss’s Atagalla run, have not yet 
produced even a single fertile egg since they were mated up. In 
fact the foregoing is the only success the experimenters can boast 
of at present. 
To summarize. The experiments have shown that— 
(1) The hybrids are not sterile when bred inter se. 
(2) The hybrids are not sterile when bred back to the domes- 
tic parent (7.e., hybrid cock with domestic hen). 
(3) There is some indication that the hybrids are not sterile 
when mated back to the jungle parent (7.e., jungle 
cock and hybrid hen). 
The sterility of these hybrids therefore cannot now be adduced 
as it was by Darwin, as one of the proofs that the Gallus Stanleyi 
is not a parent stock. 
To give the summary in greater detail the results of the mating 
are thus :-— 
Jungle cock and domestic hen.—Thirty chickens produced. 
Jungle hen and domestic cock.—No eggs laid.* 
Hybrid cock and domestic hen.—Many chickens produced.t 
Hybrid cock and jungle hen.—No eggs laid.* 
Hybrid hen and domestic cock.—No eggs fertile yet. 
Hybrid hen and jungle cock.—Two addled eggs only. 
Hybrid cock and hybrid hen.—Several addled eggs. One live 
immature chick in broken egg ; five full or nearly full-term 
chicks dead in shell; two chickens hatched out (living 
only eighteen and twelve days). 
The experiments so far have been relatively very few ; some have 
not really been tried sufficiently long, and it may be added that 
many have been tried under very unfavourable circumstances, 

* Has not been given a fair trial. Itis believed that jungle hens will never 
breed in captivity. 
+ The progeny of this mating are fertile (a) with the domestic parent, (b) 
with the hybrid parent, (c) with one another. 
