366 A. Schlieper on the Oxydation of Uric Acid 
To effect the analysis, air-dried crystals were burnt with chro- 
mate of lead: 
1. 0°345 grammes substance gave 0°334 grammes carbonic 
acid and 0-109 grammes water. 
2. 0-248 grammes substance gave 0:274 grammes carbonic 
acid and 0-092 grammes water. 
3. 0:2321 grammes substance gave by combustion with soda- 
lime 1:2998 grammes platino-chlorid of ammonium =0-08163 
grammes nitrogen. 
Calculated in per cents. : 
IL. u. il. 
Carbon, 29-91 30°13 na 
Nitrogen, ar afk 35:17 
Hydrogen, 3:97 A-12 alse 
Oxygen, é 
These numbers represent exactly the composition of allantoin 
,N,H, 0, as results from the comparison of the calculated 
and found numbers: 
Calculated. Found. 
7 40 24 30°37 30-02 
oS EN 28 35-18 35°17 
3H os “Te 4-04 
30 24 30°66 on Ka 
—- _—_———— —_—_———_——— 
9 0 
The formation of ammonia and oxalic acid in heating and 
evaporating an alkaline allantoic solution, were now explained, 
for allantoin is decomposed perfectly into these two products, by 
boiling with alkalies; C, N, H, O,+3HO=2 equivalents NH, x 
2 equivalents C, O. 
I have mentioned before that the alcoholic solution, filtrated 
from the allantoin, leaves by further evaporation, a sticky syrup 
containing potash, which, though easily soluble in water, can be 
sparated by an addition of absolute or strong alcohol to the 
watery solution, asa thick, white flocculent precipitate. This 
precipitate collected on a filter, absorbs moisture with great avid- 
ity and deliquesces; as such it is not fit for analysis: I therefore 
tried to combine the organic body with oxyd of lead, and to 
analyze it as a lead salt. The watery solution of this substance, 
was for this purpose mixed with a solution of neutral acetate of 
lead, by which a sparse white precipitate was produced, consisting 
for the greatest part of oxalate of lead, which was filtered off. 
The liquid was then mixed in two fractions with pure ammonia, 
free from carbonic acid, by which a white, thick, curdy precipi 
tate was formed ; only the first precipitation was used for the en- 
tire analysis. Dried, this lead’salt appeared as a white shining 
powder, insoluble in cold water and alcohol, little soluble in hot 
