4 PEOCEBDINGS OF THE NATIONAL MUSEUM vol.72 



The residuum of the solution equivalent to 46.8022 grams of the 

 iron was used for the determination of platinum and copper. The 

 copper content is unusually low. A faint reaction was obtained for 

 platinum by the very delicate potassium iodide test. The insoluble 

 matter was examined microscopically and found to be chiefly dust. 

 No chromite, graphite, or diamonds could be recognized. Although 

 the nickel is moderately high, the cobalt content is small. Most of 

 the determinations were repeated at least once. The sulphur result 

 is perhaps too low, due to loss as hydrogen sulphide. No trace 

 of manganese could be detected colorimetrically by the persulphate 

 method. 



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