Lx) Extra of Foureroy and Vauquelin’s 
enough, and if the urine, lefs gelatinous, is by thefe mean$ 
more coloured, has a ftronger fmell, and is more charged 
with urinary matter, it is lefs fufceptible of fermentation or 
putridity ; it preferves itfelf much longer and with its pri-~' 
mitive characters, and is more permanent: that, on the 
other hand, which is. lefs coloured, more changeable, and 
more difpofed to the formation of ammonia, depofits {fpeedily 
mucous flakes, and gives fooner a cloud and precipitate: It 
appeared to-us, that uriue lefs corruptible and lefs gelatinous, 
and in fome meafure more urinous, if I may be allowed the 
expreflion, was the fign of good health, and the produce of 
complete diveition ; while pale ure, more gelatinous and 
more decompofable, exilied mere particularly in weak fub- 
jects, and in cafes where the digettive faculties were leflened. 
There is reafon to believe that thefe two different ftates of 
urine, which exhibit it as two diftinct or different liquids, 
will one day furnith faéts of great utility to the healing art ; 
and that a folution of tan will fupply the means of diftin= 
guifhing them, and of determining their re'ation in regard 
to the nature and quantity of the precipitate which it will 
form in thefe liquids, compared i im different fubjects, or in. 
the fame at different periods. 
XI. Scheele firft announced the prefence of the: benzoic 
acid in the urine of man, and particularly in that of children. 
Rouelle the younger had before fulpeéted it in that of the 
mammefere, though he durf not give any opinion as to 
its nature. This acid is obtamed by fublimation, on heating 
the extract of urine in clofe veifels. It may be feparated till 
better by evaporating uriie>to the confiftence of clear: fyrap; 
and pouring on x the muriatic acid, by which it is preeipi- 
tated ; becaufé that acid deconrpoles the benzoat of ammos 
nia that has been formed. It ts by the latter procefs that we, 
have taucht the method of extracting it from the urine of 
horfes ie cows, and, above all, from the, water of dungs. 
hills, in fuficient abundance to fabfitute it m pharmacy. 
for that of benzoins In aword, this acid is the leaft abuns 
~ dant, and perhaps the moft variable of the matters in urine: 
It appeared to us tobe between ,.':, and 5.2.2: ) There 
are fome morbific circumftances under which ‘its quantity 
- increafes 
