EXPLANATORY AND INTRODUCTORY. 



13 



world to which the subsidence and cold climate of the 

 Glacial age did not extend. It is true that the supposed 

 Palasolithic men are often called Post-pliocene, but 

 when this term is used in a strict sense, as it is by 

 Sir C. Lyell, it is with the limitation that human re- 

 mains occur only at the close of the Post-pliocene ; or 

 the beginning of the modern period. 



Fig. 2. IMPLEMENTS OF CHIPPED STONE, NOETH AMERICA. 

 (After Squier.) 



Whatever dates we may assign to these several 

 stages of prehistoric man, and whatever value we may 

 attach to such classifications, or whatever new light 

 subsequent research may throw upon them, American 

 facts enable us to attain to absolute certainty on 

 some material points. Of these, one is that the oldest 

 populations known to us in Europe were not inferior 



