species, and which appears to indicate, that the goats and domestic sheep have something in common with their origin; and, as we know by experience, that the he-goat very readily copulates with the ewe, but that the ram is incapable of impregnating the she-goat, it is not to be doubted, that, when these animals are in a domestic state, the goat is the predominant species. Thus our sheep is a species much more degenerated than that of the goat, and there is every reason to believe that if the muflon were brought to the she-goat, instead of a domestic ram, she would produce kids approaching nearer to the species of the goat, as the lambs produced between the he-goat and ewe return nearer to the species of the ram. I know that naturalists, who have founded their knowledge of Natural History on the distinction of some particular characters, may make some objections to this doctrine, and, therefore, I shall endeavour to anticipate them. The first character of the sheep, they will say, is to be clothed with wool, and that of the goat with hair. The second character of the ram is to have circular horns, which turn backwards, and that of the he-goat is to have them straight and erect. These, they will affirm, are the distinctive and infallible marks by which sheep and goats will always be distinguished; for as to the rest, they cannot avoid acknowledging, they belong to them both in common. Neither have incisive teeth in the upper jaw, but each of them have eight in the lower; both want the canine teeth, and both have cloven feet, simple and permanent horns, teats in the same parts of the belly, both live upon herbage, and ruminate. The internal organization has still a greater resemblance, for it appears to be absolutely the same; the number and form of their stomachs, the disposition of the viscera and intestines, the substance of their flesh, the qualities of the fat and seminal liquor, the time they go with young, and the length of their lives, are perfectly the same. There only remains, then, the wool and the horns, by which these two species can be distinguished; but we have already demonstrated by facts, that wool is not so much a substance of nature as a production of climate, assisted by the care of man. The sheep of hot and cold countries, and those which are wild, have no wool, but hair, while the goats in very mild countries have rather wool than hair, for that of the Angola goat is finer than the wool of our sheep. This character, therefore, is not essential, but purely accidental, and even equivocal, since it equally belongs to, or is deficient, in both species, according to the difference of climate. The character of the horns appears to be still more uncertain; they vary in number, size, form, and direction. In our domestic sheep the rams have commonly horns, and the ewes have none; nevertheless, I have seen in our flocks rams without horns and ewes with them; and sheep not only with two but four horns. The sheep of the North, and of