C 
^ .... r ' , ' ' I ■ , 
m 0! 
44 MINERALOGICAL 
of lulphur could be perceived. It was 
changed by it into a red calx, and weigh¬ 
ed 2 drams, 20 grains, though it had loft 
its portion of fulphur, which is confider- 
able. This calx mixed with an equal 
weight of calcined borax, half its weight of 
white glafs, and a fourth part of colo¬ 
phony, and melted in a ftrong heat, 
during half an hour in a crucible lined 
with charcoal, and covered with common 
fait, gave a fmall regulus of a grey co¬ 
lour, 10 grains in weight, but which was 
fo brittle that it flew in pieces when gently 
ftruck with a hammer. The reft of 
what was reduced was in very lmall glo¬ 
bules, which lay fcattered in the powdery 
fcoria mixed with charcoal. 
The refult of this experiment proves, 
that the common dry way of trying this 
ore is totally improper. 
