154 on varieties of domestic animals. Oct. %. 
quired ofthem? The different breeds of dogs, for ex- 
ample, though not prevented by any physical bar- 
rier from intermingling, are yet so distinctly sepa- 
rated from each other by certain peculiarities, as na- 
turally to induce one clafs to afsociate together, in a 
state of freedom, in preference to others. .The 
hound, for example, would naturally afsociate with 
other hounds who pursued the game, at a slow pace, 
by the sense of smelling, in preference to any o- 
ther clafs of dogs. Should a grehound encroach 
upon this_pack, he would so often destroy the game, 
and eat it before their approach, that they would 
-find it necefsary for their own preservation to drive 
him away, or tear him in pieces. Grehounds 
would as naturally afsociate with other grehounds 
for the same reason of mutual convenience; and so 
of other varieties. Thus would a distinction be 
formed, which in a state of nature would tend to 
preserve the several breeds uncontaminated. This 
purpose would be still strengthened by the acquain- 
“tance formed by. the young of each tribe, with the 
mother and. others of the same kind, with whom 
they were accustomed to afsociate from their infancy, 
and with whom we know they preserve habits of in- 
timacy and kindnefs through life. These few par- 
ticulars, without taking notice of many others, (as 
the size, which alone would effectually prevent ma- 
ny of the breeds from ever intermingling, ) are suf- 
ficient to fhow, that ina state of nature, the diffe- 
_aent varieties of the same species of animals might 
be preserved distinct perhaps for ever. In fhort we 
do actually know of two instances where the breeds 
