THE 
EMPORIUM 
OF 
ARTS AND SCIENCES., 
Vol. IIL] August* 1814. [No. IL 
LEAD. 
THE common ore* that which is almost exclusively 
worked, is the sulphuret of lead, or galena. This is usual- 
ly a bluish ore in large plates or facets : when the facets 
are smaller, approaching to steel-grained, it is generally 
found to contain other metals, as silver, or antimony. It 
contains from 60 to 70 per cent, of lead. 
It is most easily assayed in the dry wayg most accu- 
rately in the moist way. 
As silver in particular, and frequently also antimony is 
found combined with lead ore, it will be proper to give 
the assay and analysis of several kinds, which I shall do 
from Dr. Aikin, 1 Chem. Diet. 
Assay and Analysis of the Ores . 
The analysis of the ores of lead is upon the whole ex- 
tremely simple. In general the moist way is the most 
accurate. 
Before giving the individual processes the general me- 
thods may be mentioned whereby lead is separated from 
the other metals with which it is usually combined in the 
Vol. IIL 
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