4>CQ DBCOMPOSitTG THE SVLFHATE OP BA*yTt3. 



The faiine mafs ™a^s is lo be reduced to a coarfe powder, and boiled for a 



d^'f?r"d° ^* moment with fixteen parts of water. The liquor is then to be 



filtered, and kept in well (lopped bottles. '^'i 



The time of expofure to heat may be fliortened to one half, 



if the quantity of muriate of foda be doubled, and the matter 



occafionally fl:irred. In this cafe too, double the quantity of 



water fliould be ufed to lixiviate the mafs. '^ ~ 



An addition sf To prepare muriate of barytes with this lixivium of fulphu- 



muriatic acid j.^^ ^j^- barytes, which at the fame time holds in folution muri- 



expels the lul- r r 



phureous acid ate of foda, muriatic acid is to be added in feparate portions, 



and leaves muri- 1,-]] fulphurated hi'droo;en ^as is no longer extricated. The !i- 



ates of barytes . , t ^, f ,- , , 



and of foda. ^^o^ 's then to be filtered, a little hot water is to be poured 



on the refiduum, and the liquor is to be evaporated to a pel- 

 licle. The lixivium being then filtered afrefli, is to be fet to 

 Thefecryftals cryftallize; tiie *^urlate of foda, which is much more foluble 

 baryteTare fepa-'" ^atcf tlun the muriate of barytes, and not more foluble 

 rated by cooling with heat than without, is not depofited by cooling, and tire 

 aikrevapowtioa.j^.j^l^^g of barytes cryftallizes alone. 



The remaining lixivium is to be evaporated and fet to cry- 

 ftallize again, and this'^is to be repeated till no more cryftals 

 of muriate of barytes are formed. 

 The barytic fait Thq harytic fait thus obtained, if care be taken not to cm- 

 and^purc.^ ^ "^^ P'^y ^" excjcfs of muriatic acid, is perfedly white, on ac- 

 count of the hydrofulphuret^^by which the i^ and other rae- 

 taliic fubftances are precipifeited. To be more cert^lin that it 

 contains no muriate of foda, the different products of the cry- 

 fialiization Ihould be mixed together, diflblved, and re-cry- 



Off //«? Action of Platina and Mercury upon each other. % 

 Richard Chenevjx, Esq. F. R. S. M. R. /, 4, ^-c. /vo»» 

 the Fhiiofophical Tranfa6tionsfor 1805, p. lO^. 



Freyberg, June Sd, 1^4,. 



I?«ference tothvcON the 12th of May, 1803, I had the honour of prefenting 

 author's paper ^ Paper to the.Royal Society,* the objed of which was to dif- 

 on pa a lum. ^^^^ ^^^^ nature of palladium, a fubftance juft then announced 



♦Infertcd in our Journal, Vol. VII. 55, HG. 



