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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. 
