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The obsidian bracelet was found in an Indian 

 tomb, in the province of Mechoacan, in Mexico. 

 It is extremely difficult to form an idea of the 

 manner, in which so fragile a substance has been 

 worked. The volcanic glass, perfectly trans- 

 parent, is reduced to a plate, the curvature of 

 which is cylindrical, and which is less than a 

 millimetre in thickness. 



