upon oxygenized and hyperoxygenized muriatic Acid , See. 161 
the last formed crystals, I could pick out some hyperoxygenized 
muriate of mercury. I then crystallized it over again ; and, in 
this manner, I obtained it nearly pure. This salt is more soluble 
than corrosive sublimate: about four parts of water retain it 
in solution. The shape of its crystals, I cannot well determine. 
When sulphuric, or even weaker acids, are poured upon it, it 
gives out the usual smell of hyperoxygenized muriatic acid; 
and the liquor becomes of an orange colour. This is a sufficient 
proof, that corrosive sublimate is not a hyperoxygenized muriate 
of mercury. 
I have just mentioned that, in the formation of this salt, the 
oxide of mercury, which was not dissolved by the acid, became 
of a very dark brown colour. I procured a portion of this 
oxide, which seemed different from the red oxide. It however 
retained the form, and the crystalline appearance, of the latter. 
It was soluble in nitric acid, without disengagement of gas ; and 
was precipitated from it, in a yellow oxide, by all the alkalis, 
except ammonia. It formed corrosive sublimate with muriatic 
acid ; and the precipitate by the alkalis, was the same as that 
from corrosive sublimate, made with the red oxide. Yet I am 
inclined to think, that the dark brown oxide differs in some 
essential point from the red ; but I have not yet made sufficient 
experiments to prove this opinion. At all events, the present 
object being to examine the mercurial oxides only as combined 
with muriatic acid, it would be foreign to the purpose, to enter 
upon too minute an investigation of the other states of the 
metal. This, and some other objects hinted at in this Papef, 
must be reserved for future inquiry. 
In treating the earthy hyperoxygenized muriates with phos- 
phate of silver, as I mentioned before, I observed that the liquor 
mdcccil Y 
