^4 PRETENDED NEW METAL; PALlADIUM.' 



mercury wis and mercury. Both m«tals were precipitated; and the ptefJ 

 |,recipitatcd by cipitate was fubraitted to the fame treatment as in the formeil 



iron. The ^ 



fucccfs was lefs cafe; but the Tuccefs was not fo complete. Iron can pre- 



complctc* cipitate either platina or mercury feparately ; but green ful- 



phate of iron can perform its fundion only in favour of the 



affinity of platina and mercury. Their union is promoted by 



itsa6tion; and the effeds are, in all probability, fimultane^ 



ous. The combination of the metals takes place> if I may be 



allowed the expreflion, in their nafcent metallic ftate, and in 



a fixed proportion of mutual faturation* The union of the two 



metals, therefore, is in the prefent experiment lefs intimate, 



and the button which refalts from fufing the precipitate, is of 



much greater denfity. 



^xp. 3. Zinc Exper. 3. The fame procefs was repeated, only ufing zinc 



IncompktL * inftead of iron, but the refultwas not more fatisfactory, 



Exp. 4. Mer- Exper. 4. Ipoured fome mercury into a folution of platina, 



rolution of pU- ^"^ heated them together for fome time. A precipitate took 



tina. place; but, upon fufing it into a button, I did not find it to be 



Incomplete. palladium. 



Bxp. 5. Mixed Expcr. 5. I diflblved the fame quantities of platina and mer* 

 folutions of pla- (,jjj.y g^j. \i^ Exper. 1, in nitro-muriatic acid, and evaporated 

 tma and mercury , i r ^ - 1 t » i -i- i 1 r f 1 



evaporated and thotc loiutions together* 1 then volatilized as much as 1 could 

 ignited. The of the mercury, at a red heat. At the end of the operation, 

 ^^ ^^ I obtained precifely my original quantity of platina^ reduced 



to the metallic ftate; but not one particle of the mercury re- 

 mained along with it. 

 £xp. 6, 7. Exper. 6 and 7. The fame quantities of platina and mer- 



Piatinaandmer-^, diflblved In nItro-muriatic acid> were precipitated by 



cury precipitated •' . ^ r r j 



by phofphate of phofphate of ammonia; and the liquor was evaporated. The 



ammonia. No refiduum, in a glafly ftate, was expofed to a violent heat in a 



charcoal crucible; and I obtained a melted button, which 



weighed more than the original quantity of platina, and was 



of thefpecific gravity of 14,5. On account of the eafy fufi- 



Phofphuretof bility of phofphuret of platina, I likewife tried (o combine it 



platina. dlredlly with mercury, but could not fucceed. 



Ixp. S. Platina Exptr,8. I precipitated a mixed folution of platina and 



treci'pUa^ted^v ^^^^^^y» ^^y ^ current of fulphuretted hydrogen gas; and re* 



fulphuretted hi- duced (he infoluble powder. After many attempts, in which 



drogen. In one j obtained buttons of the fpecific gravity of 14,3 and 14,5, t 

 inftance palia- ^ , . ... ^ . ° ,, % ,, .^ . ♦ 



dium. formed a piece weighing 1 1 grams, or the fpecinc gravity ot 



11,5. This 



