534 Bf. f °RDYCe and Mr. alchorne’s 
the whole fluid; , as foon as it was melted, it was removed i 
from the fire. 
The mafs, on concreting, was found divided into two ; 
a black mafs a-top, and a metallic mafs at bottom. The 
metal being aflayed by folution in nitrous acid and preci- 
pitation with volatile.alkali, fhewedno fign either of gold 
or copper; loft nothing by coppellation with lead; it 
weighed si 3 grains, which were pure fiver. 
The black mafs a-top, or .J cor ire, was boiled repeatedly 
in water, but did not all diflolve. The infoluble part was 
unfortunately thrown away ; but to the folution we ad- 
ded muriatic acid : on the addition of the acid, there was 
a ftrong fmell of hepar fulpburis y and a copious precipi- 
tate, which, on being examined by a microfcope, ap- 
peared to confift of pellucid cryftals, without the fmalleft 
appearance of fulphur. This precipitation, being expofed 
to heat, did not fmell in the leaft like fulphur; it was not 
in the leaft inflammable. Excepting then the fmell of 
hepar fulpburis , there does not appear any mark of ful- 
phur in this ore, and a very final! particle of inflamma- 
ble matter dropping in by accident would give this 
fmell. 
The foregoing experiments occafioning fome doubt of 
fulphurs being contained in vitrous filver ore, we endea- 
voured to inveftigate it by other means ; and after feveral 
experiments, 
