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 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 Linnæus 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 Linnæus 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 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 pointed out to distinguish an animal, which every one recognises at first sight, and which indeed it is impossible to mistake.