[ 8 + o ] 
equally ferves to re-vivify the afhes not only of iron, 
copper, or tin, into their refpedtive metallic forms 
and confiBence, but likewife even the calx of filver 
or gold. But further, if thefe metallic earths were 
indeed originally of a mercurial nature, and remain 
fo after calcination, how comes their mercury to 
Band fuch an immenfe heat as that of the burning- 
glafs ? whereas no known preparation of mercury, 
much lefs mercury itfelf, will Band a third part of 
the heat without being totally diBipated, and for this 
reafon mercurials, as mercurials, never can be vitri- 
fied : but thefe earths, or aflies of metals, do Band 
this exceeding degree of heat, and are vitrifiable, and 
therefore not mercurial ; and their calx may be re- 
duced to metal again, by the addition of fome lul- 
phur : but I believe no one will fay the charcoal, in 
the reduction, refunds the mercurial principle to 
them. 
PoBibly it may here be afked me, what indica- 
tion there is of any remaining fulphur in well puri- 
fied regulus of antimony, or its glafs ? I anfwer, no 
one can doubt of its being in the regulus, who knows, 
that the beB antimonial regulus will deflagrate with 
nitre, in a red-hot crucible, and give off more or lefs 
of fulphureous fcoriaj ; that flux’d with a fix’d al- 
kali- fait, it will form a kind of hepar antimonii ; 
and that fulphur may be eaffly feparated from it, 
when diflolved in aqua regia. But this is obvious; 
the fulphur indeed is not fo readily difcovered in 
glafs of antimony, but ’tis evidently there ; for when 
that glafs is finely powdered, levigated, and digefled 
with very Brong diflilled vinegar, it tinges it very 
highly, and imparts to it an emetic quality : and 
tli is 
