THE ASCENT OF PREHISTORIC MAN 



MANS CULTURAL STAGES AND PHYSICAL DEVELOPMENT 

 TO THE END OF THE OLD STONE AGE 



[DJAGONAL LINES INDICATE RACIAL PERIODS, 

 DCfT SHOWS CONJECTURED DATE OF EXTINCTION] 



ICL ACES 



BC POST-OLACIAL 

 I^LSaS 



ilk CLACUL 



3i4 INTEHGLACIAL 



•irt. GLACIAL 



PM.-CHEU.EAN 



«ntlNTER.C.UACIAL 



■C-IXXO 



2~l. GLACIAL 



_ to 



O^^K CO 



^^= CD 



^— m 



PR.M»ALAOUTHlC 



OK. 



EOLITHIO ? 



PLEISTOCENE 



Tht Brain from Ape to Man by Frtderick Tilney 

 Spff^ /5oA~ . '»4 Copyright igiS by Paul B. Hotter, Inc., N. Y. 



i 



PLIOCENE 



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