After having examined the different varieties of goats, and considered them relatively to each other, it appears to me, that of the nine or ten species of which the nomenclators speak, there is, in reality, but one; for instance, 1. The wild he-goat is the principal stock of the species. 2. The capricorne is the wild goat degenerated by the influence of climate. 3. The domestic he-goat derives his origin from the wild he-goat. 4. The chamois is only a variety in the species of the she-goat, with whom he would be able to produce as well as the wild goat. 5. The small goat with erect horns, crooked at the points, which Linnæus speaks of, is the chamois of Europe become smaller in America. 6. The other small goat with horns lying flat, and which produced with the small chamois of America, is the same as the he-goat of Africa, and the production of these two animals prove, that our chamois and domestic he-goat would also produce together, and are, consequently, of the same species. 7. The dwarf goat, which is probably the female of the African buck, and, like the male, only a variety of the common kind. 8. It is the same with the bucks and she-goats of Juda, they are only varieties of our domestic goats. 9. The goat of Angora is also of the same species, since it produces with our goats. 10. The Membrina goat, with large pendulous ears, is a variety in the race of the goats of Angora. These ten animals, therefore, are only ten different races of one species, produced by the difference of climate. _Capræ in multos similitudines, transfigurantur_, says Pliny; and in effect, we see by this enumeration, that the goats, although essentially like each other, yet vary much in their external form; and if we should comprehend, with Pliny, under the generic name of Goats, not only all those we have mentioned but also the roe-buck, the gazelle, the antelope, &c. this would be the most extended species in Nature, and contains more kinds and varieties than that of the dog. But Pliny was not sufficiently informed of the real differences of species when he joined the roe-buck, antelope, &c. to the species of the goat. These animals, though bearing much resemblance to the goat in many respects, yet are different species; and we shall see, from the following articles, how much the antelopes vary, both in species and races; and after enumerating all the goats and all the antelopes we shall find many animals still remain, which participate of both. In the whole history of quadrupeds I find nothing more difficult to explain, nor more confused or uncertain, than the accounts given by travellers of goats, antelopes, and other species which have an affinity to them. I have exerted all my endeavours, and employed all my attention, to throw some light upon it, and shall not regret my labour, if what I now write may contribute to prevent errors, fix ideas, and bring forth the truth, by extending the views of those who would study Nature.--But to our subject.