triple Sulphuret, of Lead , Antimony , and Copper. 65 
few flocculi of iron were separated; and the remainder was found 
to contain nothing but copper. 
The sulphur which had floated, was added to the residuum 
which had subsided to the bottom of the matrass ; and the whole 
was digested with muriatic acid. This solution was of a straw 
colour ; and, when separated from the sulphur, and poured into 
a large quantity of water, afforded a plentiful white precipitate. 
This precipitate was completely resolved into white fumes, by 
the blowpipe; and the muriatic solution of it, when added to 
water impregnated with hydro-sulphuret of ammonia, formed 
the orange coloured precipitate, commonly known by the ap- 
pellation of golden sulphur of antimony. 
IV. 
Muriatic acid did not immediately act upon the pulverized 
ore ; but a solution was speedily effected by the addition of a 
few drops of nitric acid : pure sulphur was separated ; and the 
liquor, being decanted into water, yielded a copious precipitate 
of oxide of antimony. 
The filtrated solution, by gradual evaporation, afforded crys- 
tals of muriate of lead ; and the lead which afterwards remained 
in the liquor, was separated by a few drops of sulphuric acid. 
The solution was now of a bright green colour, and, as before, 
was found only to contain copper, and a minute portion of iron ; 
the former was therefore precipitated in the metallic state, by a 
plate of zinc. 
These experiments, with others which 1 have not thought 
necessary to mention, prove, that the constituent parts of this 
ore are lead, antimony, copper, and a little iron, combined with 
MDCCCIV. K 
