Neither does it constitute the species identical if either or both the hybrids be even capable of fruitful intercourse with the original or parent species. Hamilton Smith goes so far as to say, that "if it even were proved that a prolific intermediate race exist, produced by the intermixture of both, it would not fully determine that both form only one original species: what forms a species, and what a variety, is as yet far from being well understood." It is, however, pretty generally agreed, that animals are of the same species, that is to say, have been derived from one common stock, when their offspring have the power, _inter se_, of indefinitely continuing their kind; and conversely, that animals of distinct species, or descendants of stocks originally different, cannot produce a mixed race which shall possess the capability of perpetuating itself. To conclude, it must be obvious, that permanent anatomical differences are the only true criteria of distinctions of species. THE BANTENG OF JAVA. _Bos Bantinger, or Bantiger. Bos Sondaicus?_ [Illustration] The above figure was drawn from a stuffed specimen in the British Museum. In colour, shape, and texture of horns, and apparent want of dewlap, it bears some resemblance to the Gaur; but in the skeleton of the Gaur the sacrum consists of _five_ vertebrae, and the tail of _nineteen_; while in the skeleton of the Banteng, the sacrum consists of but _four_ vertebrae, and the tail of _eighteen_. BRITISH DOMESTIC CATTLE. It does not come within the scope of the present work to give the varieties of Domestic Cattle; for these the reader is referred to the many excellent works already published on the subject. It will be sufficient in this place to notice a few interesting facts--statistical, anecdotal, &c.--in relation to their domestic history. INFLUENCE OF COLOUR IN BREEDING.