176 PRETENDED NtW METAL; P ALLA E>{T^^}i 



attention (o thefe reflridions. Tlie gentleman, jiift namedl^ 

 will forgive a remark, which I certainly fliould not have made, 

 it I had been iefs iiUerefted for the fuccefs of the work, in which 

 he has allifted with fo much ability* 



III. 



Enquiries concerning the Nature qf a Metallic Sahfiance lately 

 fold in London as a new Metal, under the Title of Palladium, 

 % Richard Chenevix, Esq. F. R, S. andM. R. I. A.* 



(Conclu ded frofn page 1 1 J 



kXPERIMENTS TO PROVE AFFINITY AMONG THE METALS, 



Inftances of Exp. 1. 1 dilTolved one hundred grains of filver in nitric 



affinity in metals ^p|(j^ g,-,(j precipitated by neutral muriate of platina. The 

 by muriate of precipitate, well waflied and dried, was of a bright Uravv- 

 platina carried colour, and weighed 147 grs. Reduced in a charcoal crucible, 

 cent" of the* ^^ yielded a button weighing 121 grs. and of the fpecific gra- 

 metal. vity of 1 1,6. The difference of weight, between the original 



hundred grains of filver and the 121, was owing to 21 grains 

 of platina^ which had been drawn down irt precipitation along 

 with the filver; by an affinity for that metal. This alloy is 

 a6ted upon by nitric acid^ and a great part of the platina isdif- 

 folved along with the filver, nor is it very eafy to feparate them , 

 by the common methods. | 



Mercury and Exp. 2. I diffolved one hundfed grains of filver in nitric 



ii;ver precipitat- acid, and added about 1200 of mercury. I poured the mixed 

 tv '" e^^fuu"^ folution into a folution of green fulphate of iron, and obtained 

 phate. a very copious precipitate. When waflied and dried, it weigh- 



ed 939, and was a perfed amalgam, in the due proportion of 

 mutual faturation. Its fpecific gravity was 13,2 j but no mer- 

 cury remained with it after expofure to heat. 

 Mercury and Exp. 3. I diffolved one hundred grains of gold in nltro^ 



gold precipitated muriatic acid, and added to it about 1200 grains of mercury^ 

 gaveTfine bluT Green fulphate of iron, poured into this mixed folution, caufed 

 metailic powder, a precipitate weighing 874. It was in the form of a fine blue 

 powder, not refembling an amalgam, though wholly metallic 

 Its fpecific giavity I could not afcertain ; but all the mercury 

 was expelled by heat. 

 - . The re-agents which I ufed in the following experiments, 



with recent mu- wcrc rccent muriate of tin, and green fulphate of iron. To 



riaie of tin, aud ^ brin2 



