So * 
Mr. Hatchett’s Analysis of 
operations several times,, before the whole of the powder could 
be united with the alkali. 
3. When the white precipitate was digested with solution of 
carbonate of potash, or of soda, it was dissolved, much in the 
same manner as above related ; and the properties of the solu- 
tions, when examined by reagents, were also similar, excepting 
that the orange- coloured precipitates produced by tincture of 
galls were of a paler colour. 
Tungstate of potash, motybdate of potash, and cobaltate of 
ammonia, being severally added to the solution of the white 
substance in potash, produced white flocculent precipitates. 
Hydro-sulphuret of ammonia produced a reddish chocolate- 
coloured precipitate. 
4,. As the ore was decomposed by being fused with potash, 
the following experiment affords a curious instance (among the 
many already known) of the change in the order of affinities 
produced by a difference of temperature. 
Some of the solution of the white precipitate in potash, was 
poured into the alkaline solution of iron, which was formerly 
known by the name of Stahl’s Tinctura Alkalina Mortis . Pot- 
ash was in excess in both of these solutions ; but nevertheless a 
cloud was immediately produced, and a brown ferruginous pre- 
cipitate was deposited. 
Part of this precipitate was dissolved in muriatic acid ; and 
the solution, being examined in the usual way, yielded a blue 
precipitate when prussiate of potash was added, and a purplish 
brown precipitate with tincture of galls. 
The other part of the precipitate was digested with dilute 
nitric acid ; which dissolved the ferruginous part, but leit un- 
touched a white flocculent matter, perfectly resembling the 
