Canis domesticus. Linn. Var.

The generic characters of this well known group, comprehending not only the various races of the Dog, the Wolf, and the Jackal, but also the numerous species of Foxes, which differ from the rest only in the form of the pupils of their eyes (which are round in the former, and transversely linear in the latter) may be shortly enumerated as follows. They are all furnished in the upper jaw with six sharp incisors and two canine teeth in front, and with six molars on each side; the same number of each description is also to be found in the lower, with the addition of a seventh grinder. Their tongue is perfectly smooth, the papill? which cover it[84] being soft and velvety to the touch, instead of rough and pointed as in the Hy?nas and Cats. They have five toes to each of the fore feet, of which only the four outermost touch the ground, the fifth being always more or less elevated. On the hind feet the number of the toes is no more than four, for although the rudiment of a fifth is distinctly visible in the skeleton, it is rarely observable in the living animal. On these toes they constantly support themselves in walking, the soles of their feet, or rather that part of the legs which corresponds to the soles of plantigrade animals, never being applied to the surface of the ground on which they tread. Their claws are blunt, strong, but little curved, and not at all retractile; and their use is evidently limited to turning up the earth. Their muzzle is more or less elongated to afford space for the ample series of lateral teeth; and the strength of their jaws, as well as the extent of opening between them, is by this means much diminished. In most of these particulars they exhibit a striking contrast with the more perfect of the carnivorous races, and afford grounds for expecting an equally manifest falling off from their ferocious and sanguinary propensities. The dogs are in fact by no means equally carnivorous with the cats; and their teeth, especially the grinders, are fitted as well for the demolition of vegetable as of animal substances.

In a wild state, however, they subsist themselves principally by preying upon the inferior animals, feeding with nearly equal relish upon the warm and palpitating fibres of a fresh and almost living victim, and upon the mangled carcass which taints the air with its unsavoury exhalations. Their habitation is in the depths[85] of the forest, where the larger species form themselves dens in the close and thick underwood, while the smaller burrow in the earth for shelter. Their lengthened muzzle and the great extent to which all the cavities connected with the nose are dilated, are admirably fitted for giving to the organ of smell the fullest developement of which it is capable. It is the perfection of this organ, combined with the general lightness and muscularity of their frame and the firm agility of their elongated limbs, which renders many of the species such excellent hunters, by enabling them to scent their prey at an immense and sometimes almost incredible distance, and to run it down in the chase with indefatigable swiftness and unrelaxing pertinacity.

The very terms of the specific character by which Linn?us attempted to distinguish the domesticated from the other dogs, “the tail curved upwards (towards the left),” may be regarded as affording in themselves a sufficient proof of the difficulty of the task, when so great a naturalist, after taking a complete review of all the particulars of their organization, was compelled to rest contented with a distinction drawn from so trifling and apparently insignificant a remark. It would in fact appear to be absolutely impossible to offer in any form of words whatever a character sufficiently comprehensive to combine the almost infinite varieties of this Protean race, and at the same time to separate them from those other races from which they are generally believed to be specifically distinct. To this observation of Linn?us almost the sole addition that has been made by later zoologists consists in a remark of M. Desmarest, that whenever a spot of white is found upon any part of the[86] tail of a domestic dog, the tip of that very variable organ is also constantly white; so that we are still driven to recur to the tail alone for the only uniform physical characteristics that have been poin............