66 
Mr. Hatchett's Analysis of a 
sulphur ; and, when the specific gravity, the external and in- 
ternal colour, fracture, grain, and other characters are considered, 
there can be no doubt but that at least the three first metals 
exist in the ore, in, or nearly in, the metallic state, combined with 
sulphur, so as to form a triple sulphuret ; to ascertain the pro- 
portions of which, the following analysis was made. 
v. 
ANALYSIS. 
A. 200 grains of the ore, reduced to a fine powder, were put 
into a glass matrass, and, two ounces of muriatic acid being 
added, the vessel was placed in a sand-bath. As this acid, even 
when heated, scarcely produced any effect, some nitric acid was 
gradually added, by drops, until a moderate effervescence began 
to appear. 
The whole was then digested in a gentle heat, during one 
hour; and a green coloured solution was formed, whilst a 
quantity of sulphur floated on the surface, which was collected, 
and was again digested in another vessel, with half an ounce of 
muriatic acid. 
The sulphur then appeared to be pure, and, being well washed 
and dried on bibulous paper, weighed 34 grains: it was after- 
wards burned in a porcelain cup, without leaving any other 
residuum than a slight dark stain. 
B. The green solution, by cooling, had deposited a white 
saline sediment; but this disappeared upon the application of 
heat, and the addition of the muriatic acid in which the sulphur 
had been digested. 
The solution was perfectly transparent, and of a yellowish 
