6. I have thought it necessary to point out other more general characters of this animal, some of which have been omitted by Tyson, and others but badly indicated. First, The orang-outang is the only one of all the apes that has no pouches within his cheeks on each side of the jaw, in which to put the provisions before they swallow them, for the inside of his mouth is perfectly like that of man. Secondly, the gibbon, the Barbary ape, and all the baboon and monkey kind, except the douc, have their posteriors flat, with callosities on them. The orang-outang is the only one which has those parts plump, and without callosities. The douc also has no callosities, but then his posteriors are flat and covered with hair, so that in this respect the douc forms the shade between the orang-outang and the monkeys; as the gibbon and magot form the same knot with respect to the pouches on each side of the jaw. Thirdly, the orang-outang is the only animal who has the calfs of the legs, and fleshy posteriors. This character shews that it is formed much better than any other animal to walk upright; but as its toes are very long, and its heels higher situated than in man, it runs with greater ease than it walks, and there would be occasion for artificial heels higher than those of our shoes to enable it to walk easily for a long time together. Fourthly, though the orang-outang has thirteen ribs, and man only twelve, this difference does not approximate it nearer to the baboon or monkey than it removes it from man, because the number of ribs varies in most of those species, some of them having twelve, others eleven, ten, and so on. So that the only differences between the body of this animal and that of man are reduced to two, viz. the figure of the bones of the pelvis, and the formation of the feet; these, therefore, are the only considerable parts by which the orang-outang bears a greater resemblance to the other apes than it does to the human species.