IMPLEMENTS OF METAL. 203 



shores of Lake Superior, where alone this pecuhar combination is known to exist. 

 The circumstance that the mound axes are made of unalloyed copper, does not 

 affect this conclusion ; for a large proportion of the native metal found at this 

 locality is pure. The conclusion is further sustained by the amount of the metal 

 extracted from the mounds, implying a large original supply. Besides numerous 

 small pieces, some large fragments are occasionally discovered. One of these, 

 weighing twenty-three pounds, and from which portions had evidently been cut, 

 was found a few years since near Chillicothe. Still, it does not appear that copper 

 was sufficiently abundant to entirely supersede the use of bone and stone imple- 

 ments. 



