. Elementary biology; an introduction to the science of life. Biology. Fig. 255. Skulls of primates Compare the size of the face and jaw with the size of the brain box. Note the appear- ance in man of a distinct chin and a nose bridge. /, lemur; 2, gibbon ; 3, man come down flat on the ground. The lemurs are obviously less like man than are the monkeys, and these less than the apes. 511. Man and other primates. The important differences between man and his nearest living relatives are found in the erect walk, the differentiated appendages, a distinct chin, de- cidedly larger brain, and articul
. Elementary biology; an introduction to the science of life. Biology. Fig. 255. Skulls of primates Compare the size of the face and jaw with the size of the brain box. Note the appear- ance in man of a distinct chin and a nose bridge. /, lemur; 2, gibbon ; 3, man come down flat on the ground. The lemurs are obviously less like man than are the monkeys, and these less than the apes. 511. Man and other primates. The important differences between man and his nearest living relatives are found in the erect walk, the differentiated appendages, a distinct chin, de- cidedly larger brain, and articulate speech. Animals other than man are able to get up on their hind legs for longer or shorter periods, but none of them ever acquire the definite, erect walk that all human beings develop (Figs. 253, 254), It has been pointed out that acquiring the habit of walking alto- gether on their hind legs gave the ancestors of the human race an opportunity to free their arms and hands for other activities, and that therefore it became possible to develop these organs to higher skill. We must be on our guard against assuming that the evolution of man (or of any other species) proceeded by the hereditary transmission from generation to generation of the effects of practice or Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Gruenberg, Benjamin C. (Benjamin Charles), 1875-1965. Boston New York [etc. ] Ginn and company
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