6 % 
Mr. Hatchett's Analysis of 
produces, when immersed in the acid solutions; and by the 
colour which it communicates to phosphate of ammonia, or 
rather to concrete phosphoric acid, when melted with it. 
Moreover, from the experiments made with the blow-pipe, it 
seems to be one of those metallic substances which retain oxy- 
gen with great obstinacy, and are therefore of difficult reduction. 
It is an acidifiable metal ; for the oxide reddens litmus paper, 
expels carbonic acid, and forms combinations with the fixed 
alkalis. But it is very different from the acidifiable metals which 
have of late been discovered ; for, 
1. It remains white when digested with nitric acid. 
2. It is soluble in the sulphuric and muriatic acids, and forms 
colourless solutions, from which it may be precipitated, in the 
state of a white flocculent oxide, by zinc, by the fixed alkalis, 
and by ammonia. Water also precipitates it from the sulphuric 
solution, in the state of a sulphate. . 
q. Prussiate of potash produces a copious and beautiful olive- 
green precipitate. 
4. Tincture of galls forms orange or deep yellow precipitates. 
5. Unlike the other metallic acids, it refuses to unite with 
ammonia. 
6 . When mixed and distilled with sulphur, it does not com- 
bine with it so as to form a metallic sulphuret, 
7. It does not tinge any of the fluxes, except phosphoric acid, 
with which, even in the humid way, it appears to have a very 
great affinity. 
8. When combined with potash and dissolved in water, it 
forms precipitates, upon being added to solutions of tungstate 
of potash, molybdate of potash, cobaltate of ammonia, and 
the alkaline solution of iron. 
These properties completely distinguish it from the other 
