of Urinary Coneretions, 48 
efeat part of the matter was depofited, and the liquid re- 
mained turbid. 
4. The precipitate being boiled with lye of carbonate of 
foda, more feemed to be diffolved than in pure water; but 
the folution was not clear, and, on evaporating it nearly to 
drynefs, and pouring cold water upon it, on a paper ftrainer, 
fearcely any thing but the foda paffed through with the 
water; the precipitate remaining behind on the paper. The 
tefult was the fame, when this ‘experiment was made with 
alye of carbonate of ammoniac. The refult was alfo the 
fame, with watér in which red oxide of mercury had been: 
boiled; which was alfo boiled with. this preciprnates and 
filtrated after cooling. . : 
5. A little of the precipitate soil triturated with quick- 
lime, hot water was poured upon it. The filtrated liquor 
gave the precipitate back again, on adding muriatic acid. 
6, The precipitate expofed to flame, with the blowpipe, 
turned black, emitted the fmell of burning animal matter, 
and evaporated or burnt away without any figns of fufion; 
ftaining the platina fpoon black, 
4. Five grains of the precipitate, in half an ounce of 
water, were left to fiand in a warm room, during the 
months of Auguft and September laft, without any figns 
of putrefaction appearing, or any obvious change taking 
place. . 
8. Twenty-four ounces of boiling water were faturated 
with the precipitate, and divided into fix portions; from each 
of which, on cooling, moft of it again precipitated. 
* The firft portion, on boiling with a little lye of carbonate 
of foda, (the pneumatic apparatus being affixed,) difcharged 
no carbonic acid into lime water; but a tranfparent folution 
was produced, and, on cooling, very little was precipitated. 
The fecond portion was, in the fame manner, boiled in a 
little lye of cauftic foda; which gave a tranfparent folution 
on cooling, without any precipitation. , 
The 
