A 



JOURNAL 



OP 



NATURAL PHILOSOPHY, CHEMISTRY, 



AND 



THE ARTS. 



OCTOBER, 1804. 



ARTICLE I. 



£xtra6t of a Letter from, Count ApoUos de MouJJin Pou/kkin.y 

 Charles H'atchett, Efq, F. R. S. defcrihing hh ^Method of pre 

 paring Mallmble Plaiina. Communicated on the Reqwfi of 

 the County hy Charles Hatchett, Efq. F» R. S. andnozv 

 firji publijfiedJ 



\. 1 RECIPITATE the platlna from its folution by muriate P""f ofpU^ 

 of ammonia, and wafli the precipitate with a Htlle cold water, j^ Pf^cip. the 



2. Reduce it in a convenient crucible to the well-known iol»tion by mur. 

 fpungy metallic texture> which wath two or three times- wirb^^^^'J^^^^^^^ 

 boiling water to carry off any portion of fdine matter which fpongy metal, 

 may have efcaped the adion of the fire. ' ^"^ ^*^' 



3. Boil it for about half an hour in as much water mixed 3- Boil in weak 

 with one tenth part of muriatic acid as will, cover the mafs ^^^rr\off'il^\ron 

 the depth of about haflf an inch in a convenient gbfs vetfel. 



This will carry off any quantity of iron that might ftill exift ih 

 the metal. 



4. Decant the acid Water, and edulcorate or flrongly ignite 4* EduTcprate 



»u ^1 \l- ■ ' •.:^ ' '" ' idnd ignite: 



the platina. . ■ ^ 



5. To one baft of this raetal take two parts of mercitry, and 5- Amalgamati 

 1 / • 1 y • T^., • I - wiik mercury i 



amalgamate magtals or porphyry mortar. 1 his amalgamation ' 



takes place verj- readily. The proper itaethod of cOnduifting 



it is totake abotit t<vT) 'drafra*? of mercary to three drams t>f 



Vol. IX.-*October, l&Ot. F platina. 



