426 Dr. Wollaston on a new Metal , 
and properties, as when formed from the yeliow oxide precipi- 
tated from the original salt. (D 1.) 
(E 8.) The specific gravity of rhodium, as far as could be 
ascertained by trial on so small quantities, seemed to exceed 11. 
That of an alloy consisting of 1 part rhodium and about 2 parts 
lead, was 11,3 ; which is sO nearly that of lead itself, that each 
part of this compound may be considered as having about the 
same specific gravity. 
F. As it was expected that the alcohol employed for washing 
the salt of rhodium (B 6.) would contain the soda-muriates of 
platina and of palladium, the platina was first precipitated by 
sal ammoniac. This 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 gray colour. 
(G 1.) To the remaining solution, after it had been diluted 
to prevent any further precipitation of platina, I added prus- 
siate of potash, which instantly occasioned a very copious preci- 
pitate, 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 dry, weighed i2|- 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, communicated a dark 
brown colour to the borax, as from iron, and acquired a bright 
metallic lustre, but could not be fused under the blowpipe. 
With sulphur, however, it fused immediately into a round 
globule, which, by floating/upon mercury 3 appeared of less spe- 
cific gravity than that metal. 
