of Urinary Concretions. 49 
4. This precipitate does not iridic¢ate acidity to the moft 
delicate tefts; (e, 2.) and, as it is inodorous, taftelefs, (é5 1.) 
{eareely foluble in cold water, (c, 2.) does not unite to thé 
alkali of carbonate of potafh, of foda, or of ammoniac; 
(e, 3, 4.) nor to oxyde of mercury, (e, 4.) nor to the lime 
of lime water, (ce, 8.) nor decompound foap, (e, 10.) or 
pruffiate of iron, (e, 13.) and, as its combination with 
cauftic foda refembles foap, more than any double falt 
known to confift of an acid and alkali, this precipitate does 
not belong to the genus acids. 
3. As this precipitate could not be fublimed, without 
being decompounded, like animal matter, (e, 15.) and alfo 
for the reafons mentioned in the laft paragraph, it cannot 
be the fame thing as the acid /ublimate of Scheele, or the 
fuccinic acid. 
4. As it does not appear to be putrefcible, nor form a 
vifcid folution with water, it cannot be referred to the animal 
mucilages. 
5. On account of its manner of burning in the air, under 
the blowpipe, (e, 6.) and its yielding, on expofure to fire in 
clofe veffels, the diftinguifhing produéts of animal matter, 
(efpecially ammoniac and pruffic acid,) as well as on account 
of its affording a foap-like matter with cauftic foda, this 
precipitate may be confidered as a fpecies of animal matter ; 
and, from its compofition ‘being analogous to that of the 
fubftances called, in the new fyftem of chemittry, animal 
oxides, it belongs to that genus. [ts peculiar and fpecific 
diftinguifhing properties are, imputrefcibility, facility of 
eryftallifation, infolubility in cold water, and, that moft re- 
markable property of all others, producing a pink or red 
matter, on evaporation of its folution in nitric acid*. 
I do 
* It is much to be wifhed that we poffeffed equally delicate tefts of the 
other fpecies of ‘animal matter, which are confounded together, although, 
from their obvious properties, there is reafon to believe they are of very 
Yor. II. E different 
