(_Huxley._) His facial and jaw-bones are smaller, and project far less, even in the most prognathous of men, than in the Apes; the lower front margin of the under jaw is characteristically human, being produced forward to form the chin. In the human skull there is always a spike-like bone--the styloid process--dependent from and ossified to the ear-bones. In Man the form of the pelvis--the large osseous block to which the legs are articulated--is very characteristic in its width; its great basin-shaped cavity receives and supports his lower internal organs; to its extensive external surface the muscles for enabling him to retain the erect position are attached, while its width, by separating the thigh-bones, gives to the body a form favourable to stability, which is increased by the wide angle at which the articulating head of the femur is attached to its shaft. "Were he to desire it, Man could not, with convenience, walk on all fours: his short and nearly inflexible foot, and his long thigh, would bring the knee to the ground; his widely separated shoulders and his arms, too far {206}extended from the median line, would ill support the fore-part of his body; the great indented muscle which, in quadrupeds, suspends the trunk between the blade-bones as a girth, is smaller in Man than in any one among them; the head is heavier, on account of the magnitude of the brain, and the smallness of the sinuses or cavities of its bones; and yet the means of supporting it are weaker, for he has neither cervical ligament, nor are the vertebræ so modified as to prevent their flexure forward; he could, therefore, only maintain his head in the same line with the spine, and then, his eyes and mouth being directed towards the ground, he could not see before him." (_Cuvier._) The breadth of the sacrum is equal to or exceeds its length, and the width of the pelvis exceeds its height, the reverse of what is seen in Apes. The wrist (_carpus_) in Man has no _central bone_; the ankle (_tarsus_) is longer than the metatarsal segment, and that is again longer than the toe-bones, which are more compressed than the finger-bones. In Man the teeth form a continuous series--there is no diastema, which, with the exception of the extinct _Anoplotherium_, is alone true of Man; his canine teeth are never prominent or tusk-like. The human brain differs from that of the Man-like Apes in regard to its convolutions and their separating grooves, only in minor characters; but in weight, as in capacity, very greatly. The weight of a healthy full-grown human brain never descends below thirty-two ounces, that of the largest Gorilla, far heavier than any Man, never attains to more than twenty. Yet, "the difference in weight of brain between the highest and the lowest Men is far greater relatively and absolutely than between the lowest Man and the highest Ape." (_Huxley._)