jHg ACtlON OF f LATIN A ANtf UEILcVR^s 



prccip. by gr. f, ^^^ Cfucible. This powder is acted upon by nilro-mflrktiC 

 of iron. acid, and when the; folution is neutralised, a topiovis precipi- 



tate is formed upon the addition of green fiflphate of iron. 

 This effe6l takes place even after the metal has been fufed in 

 the manner defcribed in the former part of this pa|>€r. 

 Etp. 4. Sulphur Exper. 4t If fulphur be ?ddcd to the ingredients recom"* 

 added in the laft mended by Count MulTm Puthkin^, and the v^hole treated a» 

 grea*te"prccip. '" *^^^ ^^^ experiment, the quantity of precipitate caufed by 

 green fulphaie oi iron in the nilro-rDurialic folutiOn of the 

 button which rpfu^lts frojlk llie operatioriv is generally more 

 can flder able. 

 tin <. Sulphuf Exper. 5. U fulphur be rubbed for fame time with ammo* 

 rubfa'ed w'ltfi aitf. niacal muriate of platina» and the mixture be introduced into a 

 ni.otplat.earilyj- J, |r{yrppce fiaik, it can be melted on a fand-bath. If 



melts. MerCury - . . •^■< - . » ■ ^■ 



being added, mercfiry be then thrown intp it> and the whole be well ftirred 



ftrong fufion together and healed, it may afterwards be ejtpofed to a very 



forin n. m. * itrong fire and melted into a button. If this be diffolved in 



acid and preci- niHro-murfatic acid, it will give ^ pjecipitatey as in the former 



^nrdn^^ ^'* ^' ^^'^'* ^>' ^^^^" Sulphate of iron. 



- , ExpeTi 6. If a current of fulphuretted hydrogen gas be fen t 



pfccip.from foL through a mixed folalion of platina and mercury, and the 

 of plat, and precipitate \vi>icb enfues be. collected/ the metal may be re- 

 Jmirogen bei^hg <^liiced by heat; and wtitb tbe. addition of borax, it may be 

 fijfed affords a melted inlo a button which will not contain any fulphur. Green 

 f^of'iron ^^'^* f^^P^^^te of iron eaufes a precipitate in the folution of this 



metal aiJa. 

 E 1 So like- ^-^P^^'* ^' ^^ ^^ ^ mixed folutiorf of pktina and mercury, 

 wife the precip. pbofphate of ammonia be added; a precipitate takes place. >f 

 by phofphate of jj^;^ ^^ coUeaed and reduced, it will be a^ed upon by green 

 fulpbate of iron poured into its folution, in the fame manner as 

 the metalUe buttons in the preceding examples. 

 ^ ♦ Kitr of f'-^p^^'' ^' I hixvQ already mentioned that wlipn a folution of 

 mere, at min. of nitrate .of mercury^ at the minrmum of o^idizement, is poured 

 oxidiz. precipi- -^^^^ ^ foluticn pf mtiriate of platina, a mercurial muriate of 



Cates mur. of pL . . . . . r^, r 



^he metallic platina is precipilated. The jupernatant Iiqaof may be de- 

 compound d:f- canted and the refiduum wafhed j if this be reduced and after- 

 acid is precipit'- Wards diffolved in nitro-muriatic acid,- it will yield a pi^eeipi- 

 ab'e by gr. f. of tate with green fulphate of iron. This method appears to me 

 "*"*• to be the nealeft for combining platirta and mercury, a-s th« 



aftion which takes place h independent of every fubftance 



oxcept the metab lhemfelves< 



Ejfper^ 



