Loving much to hang by the hands, with the arms stretched out above the head, the Chimpanzee has the blade-bone more like that of an ordinary Monkey, and less like that of man and the Gorilla, and its muscles are so placed as to permit of their acting readily when this position is kept up. As this position is extremely easy and useful, it is assisted by the animal’s having a short and stout collar-bone. Its arm-bone is tolerably near the length of that of man, but it is like a Gorilla’s in miniature. The bones of the fore-arm (the radius and ulna), instead of being shorter than the arm-bone, equal it in length, and the last named is much bent, so as to give a large surface for the muscles which supply the hand and wrist. As a whole, the hand of the Chimpanzee is, in proportion to the size of the animal, larger than that of the Gorilla, but the thumb is shorter, and this makes it more Monkey-like than human; and the same may be said of the lower limbs, for the thigh-bone and those of the leg, although greatly resembling those of the Gorilla, have many peculiarities which make them resemble those of the less important Monkeys. Finally, with regard to the foot, that of the Chimpanzee is more Monkeyish than that of the Gorilla. The great Ape’s foot has many peculiarities which make it differ from that of man, and these are all magnified, as it were, in the Chimpanzee, whose foot, therefore, is all the more unlike ours. It is especially adapted for grasping and climbing, and less well suited for occasionally standing erect and walking. Its heel is short and slender, and the toe-thumb is smaller, and the whole foot is slenderer, than the Gorilla’s. Moreover, it is more turned in. When young, there are no crests on the head, but with age a small one grows on each side in front, running from about the centre of each side of the brow ridge over the receding forehead, and joining together in the middle line, close to the top of the skull. This meets a larger and stronger one, which is a miniature of the head crest of the Gorilla, and which reaches from ear to ear. The use is probably for the attachment of the masticating muscles at the side, and for that of the muscles of the neck behind; but it is also a kind of ornament of the males. Strong as this Ape is in its loins, from its extra ribs, the hip-bones seem narrow from side to side; and one of the causes of this is interesting, not only because it is also noticed in the other great Apes, but also because it is one of their marked distinctions from man.