by means of Potassa and Feerrideyanid of Potassium. 369 
could only contain nitrate of potassa and the problematic organic 
substances. Oxalic acid was not present. The nitrate of potassa 
was separated for the greatest part, including a small portion of 
allantoin still present, by evaporation and crystallization. The 
mother liquid concentrated to a small volume, was then mixed 
with cold absolute alcohol ; by means of which was precipitated 
of -potassa). The filtrated alcoholic solution was then eva 
rated. to dryness in the water-bath. The pea aoe crystalline 
residue, soluble in water and mixed with concentrated nitric 
acid, a crystallization 1 of nitrate of urea, cheieieel to in its form, 
instantly took place ; the whole amount of it, did not exceed two 
to three grammes. The identity of nitrate of urea Cc, 
was, rendered unquestionable by means of a combustion analysis 
with oxyd of copper 
‘This substance thus furnished in Give tubes, a relation of. car- 
bonice acid and: nitrogen as 2:3 or together as 42, 2C«C co, 
: 66, 1CC_N. ' 
The quantity of the appeari ng urea is too small to allow the 3 
idea, that it procoeenys from the direct iy aa of the urie acid, o 
I consider it as a sec ondary product of the decomposition of a 
small portion of allantoin; 1 shall‘show hereafter, the latter suf- 
fers-an alteration in an alkaline solutions two equivalents of allan- 
toin take in their composition, ive eneek of water, and form 
with it an easily decomposable new acid C, N, N, H, O, ; this acid 
separates most probably into urea and lantanuric acid by a longer 
contact, or heating with alkalies 
CN, H , O, =lantanuric acid. ’ 
C,N, H, 0. 36° N, H, O2.=urea ' 
‘The above mentioned red io at appears likewise in 
too inconsiderable a quantity, to eemed other than a second- 
ary product of this new method a6 decortipaba urie acid ; the 
only products, which appear in notable quantity, are allantoin 
and carbonic acid. I have mentioned before that two equivalents 
of ferrideyanid of potassa, were necessary to effect the decompo- 
sition of one equivalent of. uric acid ; thus one equivalent of uric 
acid has taken up two equivalents of oxygen ; it needs now only 
two equivalents of water in addition, to allow o al 
