?m jo Aavaan tvnouvn SNoiaaw jo Aavaan tvnouvn 3noio3w jo Aavaan ivnoiivn ▼ ^ a NATIONAL IIBRARY OF MEDICINE IIBRARY OF MEDICINE NATIONAL IIBRARY OF MEDICINE NATIONAL IIBRARY OF MEDICINE 9NI3IQ3IN JO A»»»8n 1VN0UVN T hTEOQOSQ WIN to Aavaan tvnouvn 3nioio3w to Aavaan ivnouvN d0S90t;I00 IZ61 PESO 8T8 a NLM050003146 NATIONAL IIBRARY OF MEDICINE ^r.. NATIONAL IIBRARY OF MEDICINE NATIONAL LIBRARY OF MEC £0, JS THE DIRECTION OF HUMAN EVOLUTION to?.- TYPES OF PREHISTORIC MEN. Heads of Pithecanthropus ercctus (Erect Ape-man); Homo neanderthalensis (Neanderthal Man); Homo sapiens (Cro-Magnon Man). on restored skulls by Dr. J. H. McGregor, Columbia University. Originals in American Museum of Natural History. New Yor Modelled k City. / THE ^DIRECTION OF HUMAN EVOLUTION BY EDWIN GRANT CONKLIN ; S PROPESSOR OF BIOLOGY IN PRINCETON UNIVERSITY AUTHOR OP " HEREDITY AND ENVIRONMENT IN DEVELOPMENT OP MEN," ETC. NEW YORK CHARLES SCRIBNER'S SONS 1921 V.....