Nevertheless, even in Pithecanthropus, the brute is passing into the man. We note the erect attitude, to be inferred from his thigh-bone, and the considerably enlarged, though even so hardly human, brain. The Piltdown individual, on the other hand, has crossed the Rubicon. He has a brain-capacity entitling him to rank as a man and an Englishman.
It has been fully shown that they differ in no respect from the skulls of men at the present day; while the skulls of the apes most nearly anthropoid, or allied to the human form, remain as widely separated in brain-capacity as ever.
As compared with their early Tertiary representatives' some of our modern mammals have increased seven or eight-fold in brain-capacity. While the horses and tapirs and rhinoceroses were being gradually evolved from the primitive types, the Artiodactyl branch of the Ungulates the pigs, deer, oxen, etc. were also developing. We must dismiss them briefly.