4 2 3 
Jound in crude Platina. 
(B 6 .) To the solution were added 20 grains of common 
salt; and, when the whole had been evaporated to dryness with 
a very gentle heat, the residuum, which I had found, from prior 
experiments, would consist of the soda-muriates of platina, of 
palladium, and of rhodium, was washed repeatedly with small 
quantities of alcohol, till it came off' nearly colourless. There 
remained a triple salt of rhodium, which by these means is freed 
from all metallic impurities. 
(Ci.) This salt, having been dissolved in a small quantity of 
hot water, and let to stand 12 hours, formed rhomboidal crys- 
tals, of which the acute angle was about 75 0 . 
(C 2.) It was then again dissolved in water, and divided into 
two equal portions. Of these, one was decomposed by a piece 
of zinc, and the other examined by the following reagents. 
(C 3.) Sal ammoniac occasioned no precipitation ; but, when 
a solution of platina was added to the mixture, a precipitate was 
immediately formed, and the colour of this precipitate was yel- 
low ; which again proves that the metal contained in this salt, is 
neither platina itself nor that which gives the red colour to its 
precipitates. 
(C 4.) Prussiate of potash occasioned no precipitation, as it 
would have done, if the solution had contained palladium. 
( C 5. ) Hydro-sulphuret of ammonia, which would have pre- 
cipitated either platina or palladium, caused no precipitation of 
this metal. 
(C 6.) The carbonates of potash, of soda, or of ammonia, 
occasioned no precipitation; but the pure alkalis precipitated a 
yellow oxide, soluble by excess of alkali, and also soluble in 
every add that I have tried. 
(D 1.) The solution of this oxide in muriatic acid, upon being 
MDCCC1V, 3 I 
