IfRElENUED NEW metal; ^Al.tAfiiUM. Q^ 



lli5. This laft was palladium; but I could not afcertaln the 



excefs of weight, as a part of the original precipitate had been 



loll. 



£xp. 9. I mixed a folution of muriate of platina with Ejcp. 9. Muriate 

 rr , r i . • i /, • i • • T'l o* platina and 



prulliate or mercury, and obtained a (light precipitate. ■« "^ p^ufljjjg ^^ ^^^^ 



liquor was evaporated, and the whole refiduum expofed to a cuiy. Evapora* 



violent heat. This experiment did not fucceed. It was not jJe"t.^° ParSaf 



repeated fo often as the others ; but I have fome reafon to think fuccefs. 



it might be attended with fuccefs ; for I obtained, in one in- 



(lance, a (ew very minute grains, that were foluble in nitric 



acid. 



Exp. 10. I heated fome purified platina, in the form of a Exp. 10. AmaT* 



very fine powder, with ten times its weight of mercury, and mercuryl'"*Heat 



rubbed them together for a long time. The refult was, an drove oft' the 



amalgam of platina. This amalgam, expofed to a violent "^^^^'^y* 



heat, loft all the mercury it had contained ; and the original 



weight of the platina remained without incrcafe. 



Exp, 11, The belt method of forming an amalgam of Exp 11. Count 



platina, is that prefcribed by Count Muffin PuDikin. I dif- J^^'f amalgam 



folved a known quantity of plafeina in nitro-muriatic acid, of platina heated 



precipitated by ammonia, and evaporated the liquor. The fjJ^J^P^jjJ^*"^ 



refiduum was rubbed for a long time with a great quantity 



of mercury, and then expofed to a violent heat. Many 



operations failed ; in fome, I had a button of the fpecific 



gravity of 13,2. In one attempt, I fucceeded completely: 



from 30 grs. of platina, treated as above, I obtained a button 



weighing 43,5, of the fpecific gravity of 11,736, which had 



all the properties of palladium. 



Exp, 12. I fufed together, in a charcoal crucible, 100 grs. Exp. 12. Pla- 



of platina, 200 of cinnabar, 100 of lime, and 400 of calcined f.'"''* cinnabar, 



r 11-1 1 ,-i-ii , ""^^ ^^ hoxix. 



borax; and obtamed a button, which weighed more than fufed. 

 the platina, and was of the fpecific gravity of li,7. It was 

 not foluble in nitric acid; but combined with fulphur, at a 

 fed heat. 



Exp. 13. In fome experiments I^hadmade, I found that jxp. 13. Pla- '• 

 the furnace in which I formed thefe alloys, was capable of '^'"^ ^<^^<^<^ «"<* "^, 

 melting platina, without the affifiance of any flux except -^"^^jj^ ^^g^^ *■ 

 calcined borax. I therefore urged 100 grs. of platina, at a 

 very ftrongheat ; and, when I judged the fire to have attain- 

 ed its greatefl: intenfity, I poured mercury upon the platina, 

 through a long earthen tube that terminated in the crucible, 

 2 and 



