296 Mr. Chenevix's Enquiries concerning the Nature 
From all these acid solutions of palladium, a precipitate may 
be produced by the alkalis and earths. These precipitates are, 
for the most part, of a beautiful orange ; are partly redissolved 
by some of the alkalis; and the supernatant liquor of the preci- 
pitate formed by ammonia is sometimes of a fine greenish-blue. 
Sulphate, nitrate, and muriate, of potash, or of ammonia, produce . 
an orange precipitate in the salts of palladium, as in those of pla- 
tina, when not in too dilute solution ; and the precipitates from 
the nitrate of palladium are in general of a deeper orange. All 
the metals, except gold, platina, and silver, cause very copious 
precipitates in solutions of palladium. Recent muriate of tin 
produces a dark orange or brown precipitate in neutralised salts 
of palladium, and is an extremely delicate test. Green sulphate 
of iron precipitates palladium in the metallic state; and, if the 
experiment succeed, the precipitate is about equal in weight to 
the palladium employed. Prussiate of potash causes an olive- 
coloured precipitate; and water impregnated with sulphuretted 
hydrogen gas, a dark brown one. Fluoric, arsenic, phosphoric, 
oxalic, tartaric, citric, and some other acids, together with their 
salts, precipitate some of the solutions of palladium, and form 
various combinations with this substance. 
Such are the principal characters I have found in palladium, 
examined as a simple metallic body. It does not appear that, in 
stating any of its properties, except its specific gravity, the printed 
notice has been guilty of misrepresentation. 
From these experiments, it would be difficult to say of what 
metal, or of what combination of metals, palladium consists. 
We could not suppose gold or platina to be an ingredient in it, 
as it is in some measure acted upon by sulphuric and muriatic 
acids, and is wholly soluble in nitric acid. Silver is excluded, by" 
