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The author has been for many years a careful student of comparative anatomy, especially interested in the nervous system and the skull. The student of comparative anatomy sees spread out before him a picture of progressive evolution. That picture is presented in this book as the author follows evolution from the basal mammalian stock in the Jurassic period up through the higher mammals and the primates to man. In successive chapters he shows parts of the evolutionary picture as presented by skulls, teeth, limbs, brains, special senses, the digestive system and the reproductive system. Of all these the most important part is the brain. Since it is the dominant part of animal structure, the study of its evolution throws the most reliable and significant light on human origins. Professor Clark believes that his study reveals the working of the principle of orthogenesis, early and somewhat intemperately championed by Theodore Eimer,
Early Forerunners of Man: A Morphological Study of the Evolutionary Origin of the Primates. JAMA. 1935;104(9):775–776. doi:10.1001/jama.1935.02760090079042
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