53 ° Dr. fordyce and Mr. alchorne’s 
not at all like particles which had been combined with a 
menftruum , which ought either to have appeared in a 
powder, whofe particles were hardly vifible from their 
fmallnefs; or in crvftals limilar to one another. 
exp. ii. If any metal be combined with fulphur, 
mercury will not precipitate the* fulphur from it; we 
therefore took 1 40 grains of the fame ore, and triturated 
it for fome hours with about five times its weight of 
mercury: the powdered ore was w allied off from the 
mercury, the remainder put into glafs veffels, and eva- 
porated by heat : a mafs of gold was left, but part of it 
being accidentally loft, its weight could not be afcer- 
tained; it did not amount to above two or three grains at 
moft. 
The powder, wafhed off and dried, weighed 134 
grains : thefe, mixed with as much litharge, and four 
times their weight of fixed vegetable alkali, and one fifth 
of wheat flower, and the whole melted produced a re- 
gulusof lead, weighing 80 grains, which, on coppelling 
with a few grains of filver, and parting in aqua fortis , 
left one fixteenth of a troy grain of gold. 
It is to be remarked, that in great works, where gold 
is feparated from pieces of crucibles, fand, or other mat- 
ter, by amalgamation, notwithftanding the procefs be 
3 frequently 
