on the Composition of Urinary Concretions. 33 
smell of animal matter; but it became whiter, and I could just 
agglutinate the powder into one mass, although I was unable 
to render it fluid. 
2. The filtrated liquid, from a little of the matter boiled in 
water, became very turbid and white with oxalic acid : with 
lime water it grew barely curdy; and it did not alter the colour 
of turnsole, or of violet juice. 
3. The matter dissolved completely in muriatic acid, and 
also in nitric acid, without effervescence. 
This nitric solution, having been evaporated, to carry off* 
most of the free acid, instantly became very curdy on the addi- 
tion of lime water. 
It grew thick and white on adding sulphuric acid, yielding 
a copious precipitate of sulphate of lime. One portion of the 
supernatant liquor upon this precipitate, on evaporation, afforded 
an extract-like matter; which readily melted, as phosphoric 
acid does when it is mixed with a little earthy matter. To the 
other portion of this supernatant liquor was added liquid caus- 
tic ammoniac, producing a precipitate which afforded no sul- 
phate of magnesia with sulphuric acid. 
From these experiments it appears, that the above g 6 grains 
of insoluble matter consisted of phosphate of lime. Accord- 
ingly, the 300 grains of urinary concretions examined, appear 
to contain, 
grains. 
Peculiar animal oxide - 175 
Phosphate of lime - - - - g 6 
Ammoniac, (and most probably phosphoric acid united to 
the ammoniac,) water, and common mucilage of urine, 
which were not collected and weighed, by estimation 29 
3 °° 
MDCCXCVIII. F 
{ 1 T /T , *- 
1 V i . 
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*4 z s - 
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* 9/ g i 
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'£%£ £ 
300 
