a 
Chemistry and Physics. 261 
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so likewise may potash and several of its salts, or mixtures of these, 
Sulphuretied ores of copper, containing silver or gold, or both these 
nner :—The ore is first calcined 
and will contain all, or the greater part, of the silver or gold, or both, 
which the ore previously contained ; these metals are afterwards sepa- 
tated from the lead by the ordinary methods of separating silver and 
gold from lead. ‘The copper is treated in the ordinary manner, or as 
ee ; 
"hen treating ores of silver or gold, or both, which do not contain 
Copper, or which do not contain it in the state of a sulphuret, the pat- 
entee adds copper pyrites thereto, in the proportion of 4 cwts. of the 
latter to 16 cwts. of ore, and then proceeds in the manner above de- 
scribed, viz., bringing the material into a state of regulus, and fusing 
It with soda-ash, lime, coal, iron and galena. 
- Action of Sulphuretted Hydrogen upon Nitric Acid, with a new 
Process for obtaining Sulphur from Sulphate of Lime; by C. Lecomte, 
ti 
Yponitric acid. This is disproved by our author, who experimented 
Upon nitric acid, sp. gr. 1°33, freed from hyponitrie acid by nitrate o 
68° Far. 
sulphur separated, 
ed vapor. 
The sulphur separated has, although prepared at a low temperature, 
the elasticity of that which has been poured while hot into cold water. 
. l@ gases at first given off, were deutoxyd of nitrogen and hyponi- 
tric acid, the last giviog way to sulphuretted hydrogen as the action di- 
Minished, 
