E.vperimenis on Plalitii. 127 



followed by others, I flial! immediately proceed to a compa* 

 rative table of the refults : 



As the refult of No. 2. appeared to me the moft important, 

 I thought it mv dutv to repeat it, and I obtained 24 drams 

 16 grains of diii'olvcd platiua. 



In jSo. 4. there was an excefs of fea fait, which had at- 

 tached itfelf to what remained of the crude platina. 



I made my experiments with jjurificd marine fait; but as 

 in operations on a large fcale the common kind is employed, 

 I repeated them with common fnll, and found the fame re- 

 fults in equal quantities of the folvent ; with the fiime varia- 

 tion, however, in the quantity of the platina diffolved, which 

 might have been remarked in the operation performed with 

 the acids. I repeated alfo tiie fame trials, making fome 

 changes in the two lall columns : 



An excefs of marine fait whs found here alfo in Nos. 3 and 4. 

 It is feen bv thefe two tables, that the quantity of platina 

 diflolved experiences a diminution whether the proportion of 

 ^ ounces of fait per pound of acid be increafcd or diminilhed. 

 Jt however appears, that in the experiments where more than 

 7 ounces were employed, the quantity of platina diflolvcd 

 oujrhi to have been, if not greater, at leaft equal j fmce the 



nitric 



