PHYSICAL avo LITERARY. 301 
with it in the fublimation of corrofive mercu- 
_ ty, will diffolve the metallic or reguline part 
of antimony into a liquor, called duryrum an- 
timonit; and this will afterwards diffolve 
gold. Diffolve filver in aqua forits, when the 
folution is finifhed, add to it fome crude 
falt ammoniac, in powder, and fet the vef- 
in hot fand; the filver will all fall to the 
bottom: then pour the clear liquor into an- 
other glafs ; this will be found a good aqua 
regia fit to diffolve gold, regulus antimonii, 
é&c. There is another noted . experiment 
which evidently illuftrates and confirms the 
remark. If fine copelled filver is diflolved 
in proof agua fortis, and the folution is di- 
luted with an equal quantity of diftilled wa- 
ter; it will continue clear and limpid, with- 
- out any precipitation: if then a piece of po- 
-dithed copper is put into the folution, the 
filver falls gradually down, and the copper 
is diflolved, as appears by the green colour 
_ which the liquor acquires in a little time. 
When the filver is all feparated, take out 
_ the remaining copper, and put in a piece of 
_ clean iron; the green colour goes gradually 
_ off, by the copper falling down, and the i- 
~ ton is diffolved in its place: after allowing a 
fufficient 
