Professor Dana on Morbid Animal Products, 151 
was decomposed, and afforded of pure silver 1.54 grs. Now 
1.54 grs. of silver are equivalent to 1.65 of oxide of silver, 
hence the precipitate, urate of silver, consists of 
Oxide of silver 1.65 or 42.85 1. proportion 118. 
Uric acid 2.20. - 57.15 34? x5 nearly 170. 
8 
3.35 100.00 
Now 165 of oxide of silver combine with 0.754 nitric acid 
io form nitrate of silver, and this quantity of acid combines 
with U.239 of ammonia to form nitrate of ammonia 3; this 
ihen is the quantity of ammonia which was combined with 
the uric acid, separated by the silver, by double decompo- 
sition ; urate of ammonia then consists of 
Uric acid, 2.200 90.15 5 proportionsnearly,34° x5 170 
Ammonia, 0.239 9.85 1 proportion 17 
2.439 100.00 
This calculus is composed, according to the above exper- 
iments of 
Urate of Ammonia 2.439 - - 30.49 
Uric acid and Urea 5.561 - - 69.51 
8.000 100.00 
These analyses cannot be satisfactorily tried by the the- 
ory of definite proportions, because the equivalent number 
for uric acid is not well ascertained. According to Dr. 
Tuomson, it is 34, hydrogene being 1. According to 
BranpeE it is 35, hydrogene being 1, and oxygene 8. Gay 
Lussac has stated that uric acid contains one atom of azote 
and two atoms of carbon. Dr. 'THomson supposes that 
these are united with one atom oxygene. Dr. Prout, as 
quoted by Brannkr, states it to consist of one atom each of 
oxygene, hydrogene and azote, and two atoms of carbon. 
If we adopt Gay Lussac’s analvsis as correct, then the 
equivalent number for uric acid will be twenty-six, and we 
obtain also the same number from Dr. Prout, if the oxy- 
gene and hydrogene unite and form water when the acid 
combines with a basis; perhaps this is the fact, and the 
above analyses and this view of the subject mutually confirm 
~ each other, for, 
