If the publication of the present work should throw some additional light on the good qualities of this noble animal; if it should enable us to derive more advantage from the services that he can render--to train him more expeditiously and fully for the discharge of those services--to protect him from the abuses to which he is exposed, and to mitigate or remove some of the diseases which his connection with man has entailed upon him; if any of these purposes be accomplished, we shall derive considerable "useful knowledge" as well as pleasure from the perusal of the present volume. Some controversy has arisen with regard to the origin of the dog. Professor Thomas Bell, to whom we are indebted for a truly valuable history of the British quadrupeds, traces him to the wolf. He says, and it is perfectly true, that the osteology of the wolf does not differ materially from that of the dog more than that of the different kinds of dogs differs; that the cranium is similar, and they agree in nearly all the other essential points; that the dog and wolf will readily breed with each other, and that their progeny, thus obtained, will again mingle with the dog. [The relative length of the intestines is a strong distinctive mark both as to the habits and species of animals; those of a purely carnivorous nature are much shorter than others who resort entirely to an herbaceous diet, or combine the two modes of sustenance according to circumstances. The dog and wolf have the intestines of the same length. (See Sir Everard Home on Comparative Anatomy.)--L.] There is one circumstance, however, which seems to mark a decided difference between the two animals; the eye of the dog of every country and species has a circular pupil, but the position or form of the pupil is oblique in the wolf. Professor Bell gives an ingenious but not admissible reason for this. He attributes the forward direction of the eyes in the dog to the constant habit, "for many successive generations, of looking towards their master, and obeying his voice:" but no habit of this kind could by possibility produce any such effect. It should also be remembered that, in every part of the globe in which the wolf is found this form of the pupil, and a peculiar setting on of the curve of the tail, and a singularity in the voice, cannot fail of being observed; to which may be added, that the dog exists in every latitude and in every climate, while the habitation of the wolf is confined to certain parts of the globe.