THE ASCENT OF PREHISTORIC MAN 



MANS CULTURAL STAGES AND PHYSICAL DEVELOPMENT 

 TO THE END OF THE OLD STONE AGE 



[DIAGONAL LINES INDICATE RACIAL PERIODS. 

 DOT SHOWS CONiECTURED DAW OF EXTINCTION] 



ICE ACES 



BC POST-OLACIAL 



■3.d INTERGLACtAL 



2ni INTEfi-GLAClAL 



PR,E-PALyEOLITHIC 

 on. 

 EOLITHIC ? 



PLEISTOCENE 



The Brain from Apt M Man by Frederick Tilnty 

 Spf^ tb^y^ ■ ■t6 Copyright iglS by Paul B. Hoeber, he., N. Y. 



PLIOCENE 



"> 



