ae 68 ai W. Gibbs on the Platinum Meials. 
of caustic potash and two of saltpetre. The fused mass is to 
be poured out upon a stone, allowed to cool, broken into small 
—_ or powdered, and then introduced into a flask which is to 
e filled with cold water and allowed to stand for twenty-four 
hours. The clear deep orange red solution of osmate and ruthe- 
po e 
unattacked ore is then to be fused a second time with potash and 
saltpetre and treated as before. Claus asserts t e has been 
able in thi ner to resolve the Siberian osmiridium com- 
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