72 



SOCIAL EVOLUTION 



tinct, or no longer the same as those in the sunoniidinir 

 waters. 80 But while the position in or under the drift 

 which some glacier or glacial river has transported and 

 finally d. ]M^it,,l in over accumulating layers, constitutes 







r. "Dmr 



In, IRE 26. Diagram <>f ( 'n> Mn^iimi dot to, where Remains of Pre- 

 !ii-t<>] ir M-n were found. 



quite conclusive evidence, the position under stalagmite 

 beds and kitchen-middens does not furnish as reli;ill 

 proof of antiquity. The growth of stalagmite beds is 

 irregular and depends upon conditions which are sub- 

 ject to some variation. In the case of the kitchen-mid- 

 den, some shells are accumulated with great rapidity 

 so that in a comparatively short lime a considerable pile 



aoKeane, op. ctt., pp. 76-77, 96. 



