On a new Metal, found In crude Plat'inat 173 



and about 2 parts lead, was 11-3; which is so nearly that 

 oF lead itself, that each part of this compound may be con- 

 sidered as having" about the same specific grav.ty. 



F. As it was expected that the alcohol eniployed for 

 washing the s.dt of rhodimu (^B 6.) would conturii the soda- 

 muriates of platina and of palladium, the phuina was first 

 precipitated by sal ammoniac. Tiiis precipitate was of a 

 deep red colour; and, when it had been heated, to expel the 

 sal ammoniac^ the platina which remained was of a dark 

 grav colour. 



(G 1.) To the remaining solution, after it had been 

 diluted to prevent any further precipitation of platina, 1 

 addcJ prussiate of potash, which instantly occasioned a very 

 copious precipitate, of a deep orange-colour at first, but 

 changing afterwards to a dirty bottle-green, which I ascribed 

 to iron contained in the prussiate. 



(G 2.) This precipitate, when drv, weighed 124- grains. 

 After it had been heated, it left a metallic residuum, in small 

 grains, of a gray colour, weighing nearly 7 grains. A small 

 portion of it being heated with borax, connnunieated a dark 

 brown colour to the borax, as from iron, and acquired a 

 bright metallic lustre, but could not be fused under the 

 blowpipe. Witli sulphur, however, it fused immediatelv 

 into a round globule, which, by floating upon mercurv, 

 appeared of less specific gravity than that metal. 



(G 3.) The whole quantity was then treated in the same 

 manner, and purified by cupellation with borax, till it cooled 

 with a bright surface. From the globule the sulphur was 

 expelled, by exposure to the extremitv of the fiarae; and it 

 became spongv and malleable, weighing in this state very 

 nearly 5 grains, * 



(G 4.) A portion of this metal was dissolved in strong 

 nitrous acid, was precipitated by green sulphate of iron, and 

 in other respects possessed all tht properties-ascribed to the 

 palladium oilered for sale, in the printed paper that accom- 

 panied it, as well as others since noticed bv iVIr. Chenevix. 



(G 5.) In its precipitation by prussiates, it differs most 

 esstntlally iVom platina; and consequently is by no means 

 difficidt to be distinguished, or separated from it. 



(G (i.) The action of muriate of tin upon the solutions 

 of these metals is also totally different. A dilute solution 

 of platina, is thereby changed from a pale yellow to a trans- 

 parent bluod-red. A solution of palladium, on the con- 

 trary, usually becomes o])aqtie, by the formation of a brown 

 or black precipitate; but, if mixed in such proportion as to 

 remain traiispareut, it changes to a beautiful emerald-green. 



(G 7.) 



