As the chamois which was transported to and became less in America, produces with the small goat of Africa, there can be little doubt but he would also produce with the she-goats of the common kind. The chamois, therefore, is only a constant variety in the species of the goat, as the bull-dog is in that of the dog; and, on the other hand, we can scarcely question that the wild goat is the primitive goat in the state of nature and, is with respect to domestic goats, what the muflon is to the sheep. The wild goat exactly resembles the domestic he goat, in figure, conformation, and in natural and physical habits; it only varies by two slight differences the one exterior, the other interior; the horns of the wild goat are larger than those of the common he-goat the former having two longitudinal ridges, and the latter but one; they have also large transverse rings which mark the number of years of their growth, while those of the common he-goats are only marked with transverse strokes. The figure of their bodies is in other respects perfectly alike. The interior part is also similar, excepting the spleen, which is oval in the wild goat, and approaches nearer to that of the roe-buck, or stag than that of the he-goat, or ram. This last difference may proceed from the violent exercise of this animal. The wild goat runs as fast as the stag, and leaps lighter than the roe-buck; the spleen, therefore, ought to be made like that of the swiftest running animals. This difference, then, is owing less to Nature than to custom, and it is to be presumed, that if our domestic he-goats were to become wild, and were forced to run and to leap like the wild goats, the spleen would soon assume the form most convenient to this exercise. With respect to his horns, the differences, though very apparent, do not prevent their more resembling those of the he-goat than of any other animal. Thus the wild and common he-goat approaching nearer to each other than to any other animal, even in this part, which is the most different of all, we must conclude, as they are alike in every other particular, that, notwithstanding this slight and single disagreement, they both are animals of the same species.