of the Wolf, Jackal, and Dog. 263 
fame genus, I do not know ; but 1 fhould rather fuppofe them 
to be all ol one fpecies. What is with me an argument in 
favour ot this luppofition is, that, if there were Wolves of 
diftiii£l Ipecies, we fhould have had by this time a great variety 
of that fpecies of Wolves, with the various difpofitions ariling 
from variation in other refpedts ; and thofe varieties now 
turned to very ufeful purpofes, as has been the cafe with 
the Dog; for all the Wolves we are yet acquainted with, 
have naturally the principle of cultivation in them, as much 
probably as any animal, or as much at lead: as thofe Wolves we 
now know to be Dogs. The not having a civilifed fpecies of 
Wolf is, indeed, with me a proof that they are all of the fame 
Ipecies with the Dog. If they are all of the dime fpecies with 
the Dog, then the firft variety that took place was dill in the 
character of a Wolf, differing only in colour, or fome trivial 
circumftance, which could only take place from a difference in 
climate ; civilifation or cultivation in a date of nature being 
the dime in them all. Where they became Jackal, or what 
we now call Dog, is difficult to fay ; or what Dog we can call 
the drft remove, as many Dogs differ very much from one 
another; or whether the Jackal is the intermediate link be- 
tween the Wolf and the Dog. In either cafe we have three 
great varieties in this fpecies, Wolf, Jackal, and Dog, with the 
varieties in each. If the Dog is proved to be the Wolf tamed, 
the Jackal may probably be the Dog returned to his wild 
date. 
To afeertain the original animal of a fpecies, it is proper to 
examine all the varieties of that fpecies, and fee how dir they 
have the ehara&er of the genus, and what refemblance they 
bear to the other fpecies of the genus ; for it is natural to fup- 
pofe, that the original, or the animal which is neared to it, 
Q q 2 will 
