From the National Intelligenccr.
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We have been permitted to take q copy of the fol- lowing letter. from Mir ADAMS to gentleman in this city, for publication. The subject itself is nte resting, but that interest Is greatly enhanced by the scientific, and instructive manner in which the sub- ect is treated by the distinguished writer. The let ter 1t may be proper to mention, elicted by the following circumstance. Several years ago. the gen. teman referred to, had the pleasure of passing day with MT ADAMS, in Massachusetts, during which turn in the conversation led the latter to speak of the properties of platina, and the advantages which that metal possessed for the purposes of coin &c. The appearance few days ago, of an article in a New York paper mentioning the recent coinage of this metal, by the Russian Government, reminded the gentleman of the observations of Mir ADAMS he sent him the paper, and the following letter was the consequence. We have not a copy of the article referred to- or would insert that also, for the bet ter understanding of the subject

 WASHINGTON, February 7, 1881.

 DEAR SIR: Accept my thanks fer the kind transition of the Evening Post, containing the very interesting article upon the new Russian Platina Coin; and also of reminding me of one of the most pleasant days that l remem- Der to have passed, although the conversation respecting the use of Platina for coinage, had escaped my recollection. The project of coinng Platina was, if not originally conceiv- ed, most eagerly pursued by the late very in genious Dr Brick Bchlman. In the year 1915, he presented Memoir on this subject, to several of the Governments of Europe-to France, Great Britain, and Austria, as I think he himself informed me. The specific gra- vity and intense solidity of Platina, render it in some degree manageable for conng.- The usual instruments employed at Mints for gold and silver, not being of sufficient power to stamp distinct impression upon the metal, Dr Bohlman had invented an instrument ade- quate to that purpose and at the Mint in Pa ris, had caused to be struck, impressions of several of the medals of Napoleon, some oi