874 -Dr. watson^ Experiments and 
the ore, is a conclusion upon which, from a variety of 
experiments, I am difpofed to rely. 
There are annually fmelted in Derbyshire about ten 
thoufand tons of lead ore : now if means could be in- 
vented (which I think very poffible) of faving the fut- 
phur contained in ten thoufand tons of ore, fuppofing 
that the ore Should only yield one tenth of its weight of 
fulphur, though it unquestionably contains more, Der- 
byshire alone would furnifh annually one thoufand tons 
of fulphur, the value of which would annually be about 
fifteen thoufand pounds. I mention this circumstance 
thus publicly, in hopes that the lead fmelters may be in- 
duced to profecute the objedt. If the fulphur contained 
in lead ore could be collected, it would not only be a lu- 
crative bufinefs to the fmelters, but a great faving to the 
nation. We at prefent import the fulphur we ufe, and the 
confumption of this commodity is exceeding great, in the 
making of gunpowder, in forming the mixture for cover- 
ing the bottom and Sides of Ships, and in a great variety of 
arts. The fmelters need not be apprehenfive left the qua- 
lity of the ore Should be injured by extracting the fulphur. 
Eighteen hundred weight of ore, from which the ful- 
phur has been extracted,. will certainly yield as much lead 
as twenty hundred weight of ore, from which the fulphur 
has not been extracted, and it will probably yield more. 
Arfenic 
