[ «33 ] 
mony are detonated and calcined in a proper fare, a 
mere inert calx, or antimonium diaphoreticum, as it 
is called, comes out, not in the lead emetic or ca- 
thartic. On the other hand, if only one- eighth of ni- 
tre had been fufed with the antimony> a very mild 
kind of regulus medicinalis had been the confe- 
quence. So likewife, if one part of fait of tartar is 
fluxed with five parts of crude antimony, a very 
gentle medicinal antimony, or, as more commonly 
called, regulus medicinalis, is prepared ; and yet if 
two or three parts of fix’d alcali fait, and one of the 
fame mineral, are melted together, a very draftic kind 
of hepar antimonii, and commonly a fmall quantity 
of regulus, enfue. Nay, antimony well roafted, cal- 
cin’d, and then flux’d into a glafs, without the ad- 
dition of any other body, becomes the moft virulent 
emetic in nature : but if this very glafs is only cal- 
cined again by the concentrated rays of the fun, 
through a large burning-glafs, it is turned forthwith 
into an inactive calx, or a fort of antimonium dia- 
phoreticum. The fame is effected by burning the 
vitrum antimonii with about an equal quantity of 
nitre. 
Thefe are fadfs, which nothing but repeated ex- 
perience could inform us of; and yet, however flrange 
they may appear, perhaps, when we come more 
nearly to examine the matter, we may pretty clearly 
difcover the reafon of them. 
The cafe feems to be thus : Clean, crude anti- 
mony confifls of much fulphur, and a confiderably 
greater quantity of reguline metallic parts. The ful- 
phur, or at leafl: what may be called the external ful- 
phur, is little or nothing different from com- 
y N mon 
