of Urinary Concretions. 43 
tafting weakly of foda. This foap-like matter weighed 
280 grains. 
(c) The decanted liquor, (,) being mixed with the above 
filtrated liquors, on evaporation to three ounces, afforded no 
depofit on ftanding, although it was a very heavy and foapy 
liquid to the feel; but, on adding diluted fulphuric acid 
gradually, till-it ceafed to become turbid, a fediment was 
depofited, which was a very light, white, impalpable powder, 
in weight, when dried, 26 grains, The liquid from which 
this powder was precipitated, being evaporated, afforded 
nothing but fulphate of foda, and a few grains of cryftals, 
which feemed to be phofphate of foda. There was alfo a 
blackifth matter, which burnt like horn, or other animal 
matter, and did not leave a pink or rofe-coloured matter; 
on evaporating the folution of it in nitric acid to drynefs, 
but left a carbonaceous refidue; whereas, the white preci- 
pitate, fo treated, afforded a beautiful pink matter, 
(d) 250 grains of the foap-like matter (4) being diffolved 
in eight ounces of pure water ; 
Ti ie little of this folution, further diluted by one ounce 
of water, grew milky on adding a few drops of nitric acid, 
but became lefs fo on ftanding. On adding more nitric 
acid, and heating it, the mixture became quite clear: by 
adding a few drops of lye of eauftic foda, a very flight curdy 
appearance took place. 
2. On adding, to the fame diluted folution, a little of the 
diluted fulphuric or muriatic acid, milkinefs enfued, and re# 
mained, although the acids were added till the mixture was 
extremely four. On adding lye of cauftic foda, much more 
than to faturate the fuperabundant acid, the mixture became 
clear again; and, on adding the acids a fecond time, the 
milkinels was reproduced. It was found that the milkinefs 
could be produced and deftroyed, or clearnefs be produced, 
by the alternate addition of the acid and alkali, for an un- 
limited number of times. If the nitric acid however was 
ufed, at length no milkinefs could be induced, [f carbonate 
of 
