304 Dr. Wrruerine’s Experiments and Objervations 
not altered in its weight, was not ated upon by acids of the 
ufual ftrength, and had, under the blow-pipe, the properties 
mentioned at A. 2. | 
3. Some of the: folution in the ebocentnathdl vitriolic acid 
was left expofed to the atmofphere, that the acid might flowly 
attract water. Atter-fome days, beautiful cryftals appeared 1 ill 
the fhapes of. ftars, fafcize, and other radiated forms. | 
4. To another portion of this folution mild fixed yeast 
alkaly was added; but the precipitate appeared to be the mar- 
mor metallicum unchanged. a 
D. One ounce of this marmor metallicum in fine powder 
was fluxed in a crucible with two ounces of falt of tartar, un-> 
til it ran thin. This fubftance, boiled with water in a Flo-) 
rence flafk, left a refiduum of fix drams. 
E. This refiduum was thrown into water, and pure nitrous 
acid added, until there was no more effervefcence. The un- 
diflolved part weighed 52 grains. 7 
F. This undifflolved part appeared to be the original fub- 
{tance no ways changed; for it did not diffolve in nitrous or 
marine acids, but did wholly diflolve in the greatly concen- 
trated and boiling vitriolic acid, from which it was again t 
rated by the addition of water. (C. 2.) 
G. The felution D. was faturated with diftilled vinegar, “pil 
then evaporated to drynefs, but with lefs than a boiling heat., 
‘The fal diureticus, thus formed, was wafhed away with alco- 
hol. The remaining falt weighed 5 drams nearly. 
2. This falt had the appearance and the tafte of vissiolatall 
tartar; it decrepitatedin the fire; roafted with charcoal-duft, 1 it 
formed a hepar fulphuris; and with muria calcarea gave a 
precipitation of felenite. 
5 a The 

