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three months old, indistinguishable from a pure-bred bison of 
the same age, having, in contradistinction to the long tail of 
the mother, the very short bent tail of the American bison.” It 
will perhaps render the relation of these hybrid animals more 
easily understood if I quote Mr Bartlett’s table, the males being 
distinguished by ¢, and the females by ¢. 
PEDIGREE OF HYBRID BOVINES. 
Zebu ¢ Gayal 9 
Female hybrid (zebu and gayal) American bison ¢ 
Born Oct. 29, 1868. 
Female hybrid (zebu x gayal x bison) Bison ¢ 
May, 1881. 
Female hybrid (zebu X gayal x bison X bison) 
Born March, 1884.* 
Another instructive instance has been recorded by Professor 
Kuhn, of Halle, respecting the interbreeding of the gayal, Bos 
frontalis, and some of the ordinary breeds of the domestic ox of 
Europe. A young bull and a cow gayal were received from 
Calcutta, June 18th, 1880; the bull paired readily with cows of 
every variety of domestic cattle, and numerous hybrids were born, 
nine males and ten females; of these the older ones of both 
sexes have already (Field, January 15th, 1885) been used for 
further experiments. Females on being paired with an ordinary 
European bull, in every case proved fertile, conclusively, so far, 
proving the fertility of the hybrid gayal cows when paired with 
European bulls of unmixed blood. But the hybrid gayal bulls, 
without exception, have proved absolutely sterile, although 
they have readily paired both with hybrid females and cows of 
unmixed European races. 
*ZOOLOGICAL SOCIETY’s GARDENS, REGENT’s Parxk, Lonpon, N.W., 
December 18th, 1888. 
Dear Sir,—The female hybrid born 1884 is now in calf by the Bison. The 
hybrid born 1881 produced a bull calf, now 10 months old; she is again in 
calf by the Bison. I should much like to carry out the crossing with other 
_bovines, but I have not the means of so doing. 
Yours faithfully, 
Dr Day. A. D. BARTLETT. 
