An introduction to the study of social evolution; the prehistoric period . From Birkner. Der Diluviaie Mensch in Eurri FiGUEE 31. Flint Implements of the ilousterian Epoch. distinguishes the Acheulian from the Chellean. Indeed,it is so skilfully done as virtually to eliminate the zig-zag nature of the edge formed l)y the meeting of the twochipped ^- The men of the old river drift musthave had strong arms and skilful fingers, for it must have 33 ilacCurdy, G. G.—The Caveman as Artist, Century, July, 1912, vol,l\x.\lv., p. 4-

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