fublimate, mixed with the zinzmiter , 
was fublimed, unaltered, in needle-like 
cryftals the remaining tin-ore was alfo 
not changed, 
§ 9 * 
The moft accurate method of ana- 
lyfing this mineral, is that defcribed 
in § 4. according to which, by repeated 
experiments, the fulphurated tin-ore 
from Cornwall, of the pure light co¬ 
loured kind, was found to contain in 
a hundred. 
Sulphur, — — 25 
Tin, — — 34 
Copper, — 36 
Iron, ——- -- 3 
Earth of the ftony matrix, 2 
100 
The proportions in the darker vari¬ 
eties of this ore, are fomewhat dif¬ 
ferent. 
