Alkaline nitrites upon Urie acid. 219 
tiful crystals of plumbic oxalo-nitrate. Of this salt 0°7315 gr. 
gave 0:4933 PbO = 67°43 .per cent ; the formula Pb(€,9,) 
+ PL(N®,), + 2H, requires 67:47 per cent. Furthermore 
it was found that 664 milligrams of the salt required for 
oxydation, 27-63 c. c. of a solution of potassic hypermanganate 
of which 27°73 c.c. corresponded to 16 milligrams of oxygen. 
This fully identifies the salt. 
A portion of the lead salt precipitated by plumbic acetate 
from the mother-liquor of the potassic stryphnate was boiled 
with an excess of ammonic carbonate and the filtrate allowed to 
crystallize, It had all the properties of pure ammonic oxalate. 
0°142 gr. required for oxydation 18°56 c. c. of potassic hyper- 
manganate, of which 18°51 c.c. corresponded to 16 milligrams 
of oxygen. 
These results show conclusively that oxalic was the only 
organic acid present. The quantity of potassic stryphnate 
formed by the action of potassic nitrite upon uric acid is very 
small, amounting to not more than five per cent of the latter ; 
I cannot, therefore, with any reasonable degree of probability 
express the reaction in the form of an equation in which all the 
products of the decomposition shall appear. The derivation of 
stryphnic from uric acid may very probably be represented by 
the equation 
€,H,N,0, + HNO, = €,H,N,9. + 60,+H0,0; 
and the formation of allantoin by the equation 
€,H,N,0, + 2HNO, = 6,H,N,0, + €6, +2N0. 
_As it seemed possible that stryphnic acid_ might be formed 
directly from allantoin by a reaction obtained by the equation 
€,H,N,0, + 2(HNO,)= €,H,N,9, + HNO, +2H,9; 
I endeavored, but without success, to obtain it by treating pure 
allantoin with potassic nitrite. : 
_ Potassic stryphnate gives with acids, after a short time, a pre- 
and consider it therefore as most probable that the acid is 
monobasic. The salt gives crystalline precipitates with the 
salts of various metals; with cupric sulphate a pale bluish 
tather flocky precipitate soluble in hot acetic acid ; with ferrous 
sulphate a flocky precipitate, which soon becomes granular 
_ crystalline and pale yellowish white ; with cadmic sulphate per- 
fectly white granular crystals; with manganous chlorid a 
white crystalline precipitate, and with mercurous nitrate a 
Snow-white, very copious precipitate. The salts of barium, 
strontium, calcium, magnesium, lead and zine are easily pre- 
ared by double decomposition. 
