218 ’ W. Gibbs on the action of the 
The combustions were all made with plumbic chromate, and 
the nitrogen determinations with the assistance of Sprengel’s 
mercurial pump. Orystallized potassic stryphnate contains 
three atoms of water to two molecules of salt : 
0°6338 gr. dried in pleno over sulphuric acid lost by heating to 102° 
C. 0°0800 gr. water = 12°62 percent. 100 parts of the crystal- 
lized salt, 
2(€,H,KN,0,.)+3H, 9, in becoming anhydrous should lose 12°38 
per cent. 
The accurate determination of the alkali in this salt is ex- 
tremely difficult. The salt on being heated melts and takes 
an orange color. It then on carbonization intumesces and 
continued for a long time, the allantoin disappears entirely. 
The mother-liquor in question is to be evaporated on a water 
bath to dryness, and the dry mass extracted with alcohol. After 
distilling off the alcohol basic acetate of lead yields with the 
aqueous solution a more or less copious white precipitate which, 
after washing and decomposition by sulphydric acid gas, yields 
a colorless solution, from which beautiful prismatic crystals 0: 
allantoin may be obtained. In one experiment, cupric acetate 
was added directly to the solution obtained by the action of 
potassic nitrite upon uric acid. A flocky blue precipitate was 
down, and the filtrate from this deposited on standing 
fine colorless érystals which had all the properties of allantoi. 
08782 gr. gave 0°3077 gr. water and 0°9779 gr. carbonic acid = 
30°37 per cent carbon and 3°89 per cent hydrogen. 
The formula €,H,N,@, requires 30°38 per cent carbon and 3°80 
nt hydrogen. 
The crystals obtained by the decomposition of the last com- 
pound obtained as above, were also analyzed : 
0°8650 gr. gave 0°3121 gr. water and 0°9623 gr. carbonic acid = 
30°50 per cent carbon and 4-01 per cent hydrogen. 
prove the existence of oxalic acid in the mother 
To 
from the potassie stryphnate, plumbic acetate was added, 
buff colored precipitate washed, treated with very dilu 
nitric acid and filtered. The filtrate gave abundance of beau- — 
* Zeitschrift fir analytische Chemie, B. vi. 
STs eee REE Nw Tee eee ene See 
