These stories, however, go only a little way to prove that the dog and the wolf have one common origin. [There are some naturalists that even go so far as to state that the different varieties of dogs are sprung from, or compounded of, various animals, as the hyaena, jackal, wolf, and fox. The philosophic John Hunter commenced a series of experiments upon this interesting subject, and was forced to acknowledge that "the dog may be the wolf tamed, and the jackal may probably be the dog returned to his wild state."

The ancient Cynegetical writers were not only acquainted with the cross between the wolf and dog, but also boasted the possession of breeds of animals, supposed to have been derived from a connection with the lion and tiger. The Hyrcanian dog, although savage and powerful beast, was rendered much more formidable in battle, or in conflict with other animals, by his fabled cross with the tiger. In corroboration of this singular, but not less fabulous belief, Pliny states that the inhabitants of India take pleasure in having dog bitches lined by the wild tigers, and to facilitate this union, they are in the habit of tieing them when in heat out in the woods, so that the male tigers may visit them. (See L. 8, c. xl.)

There is, however, but little doubt that the wolf and dog are varieties of the same family, as they can he bred together, and their offspring continuing the cross thus formed, will produce a race quite distinct from the original. French writers do not hesitate at all upon this point, but even assert that it is very difficult to take a she-wolf with male dogs during the period of oestrum, parceque la veulent saillir et covrir comme une chienne.

Baudrillart, in the "dictionaire des chasses," further remarks that the mongrels produced by this connection are very viciously disposed and inclined to bite.

The period of utero-gestation, and the particular mode of copulation in the wolf, is the same as that of the canine family, which two circumstances are certainly very strong presumptive evidences of the similarity of the species. The dogs used by our northern Indians resemble very much, in their general appearance, the wolves of that region, and do not seem very far removed from that race of animals, notwithstanding they have been in a state of captivity, or domestication, beyond the traditionary chronicles of this rude people.

Another strong circumstance in favour of the common origin of these two quadrupeds, is the existence in our own country of the Canis Latrans, or prairie wolf, who whines and barks in a manner so similar to the smaller varieties of dogs, that it is almost impossible to distinguish his notes from those of the terrier.

Major Long remarks that "this animal which does not seem to be known to naturalists, unless it should prove to be the Mexicanus, is most probably the original of the domestic dog, so common in the villages of the Indians of this region, some of the varieties of which still remain much of the habit and manners of this species." (Vol. i, page 174.)