It appears, then, from these facts, that the Negroes are blacks of a different species from the Caffres. From the descriptions we have given, it is also evident that the colour depends principally upon the climate, and that the peculiarity of the features depends greatly on the customs prevalent among different nations, such as flattening the nose, drawing back the eye-lids, plucking the hair out of the eye-brows, lengthening the ears, thickening the lips, flattening the visage, &c. No stronger proof can be adduced of the influence of climate upon colour, than finding under the same latitude, and at the distance of 1000 leagues, two nations so similar as those of Senegal and Nubia; and also that the Hottentots, who must have derived their origin from a black race, are whiter than any other Africans, because the climate in which they live is the coldest. Should there being a tawny race on one side the Senegal, and perfect blacks on the other, be stated as an objection, it is only necessary to recollect what has been already intimated concerning the effects of food, which must operate upon the colour, as well as upon the temperament of the body in general. An example may easily be had in the brute creation. The flesh of the hares, for instance, which live on plains and marshy places, is much more white than those which, though in the same neighbourhood, live on mountains and dry grounds. The colour of the flesh proceeds from that of the blood, and other humours of the body, of which the quality is necessarily influenced by the nature of the nourishment.