THE ASCENT OF PREHISTORIC MAN 



MANS CULTURAL STAGES AND PHYSICAL DEVELOPMENT 

 TO THE END OF THE OLD STONE AGE 



[DIAGONAL LIHES INDICATE RACIAL PERIODS, 

 DOT SHOWS COHlBCrURBD DATE OF EXTINCTION] 



ICE AGES 



i.^ INTEHGLACIAL 



2,J.1NTER.&L*C1AL 



LOWER, 



PAL/EOLITHIC 



ITU.-CHLLLEAN 



Tht Brain fjom Aft K Man by Frejrriclt Tilney 

 5^#u- /5»~- '«<' Copynght i(>28 by Paul B. Hotbtr, Inc., N. Y. 



PHE-PAL/EOLITHIC 



OR, 



E.OL1THIC ? 



PLEISTOCENE 



PLIOCENE 



"> 



