114 Journal of the Asiatic Society of Bengal. [April, 1911.] 
the ‘‘ Crum”? with solid excess of hydrazine sulphate, total volume 
of gas equal to 3°7 c.c. and N=2°7 c.c. ; 8x 55=4:4 
Therefore total volume =8'1 ¢.c. ; theoretical volume = 8°0 c.c. 
for it is evident. Non-ionised nitrites cannot take part in the 
reaction. 
Estimation of Nitritic Nitrogen. 
The most far-reaching result of the reactions indicated 
above, is the very easy and convenient estimation of the nitritic 
content of nitrites in general, as weli as those of allied organic 
ases, e.g., tetralkylammonium bases. On comparing the 
nitrogen evolved is strictly 2/3rds of what is contained in the 
amount of nitrite taken for experiment. It will not be useless 
to repeat that this exactness of the volume of the residual gas, 
made up to 
date, and the two-thirds rule has been found to be unswervedly 
correct. The following figures will justify this assertion :— 
_ “Nitritic’’ nitrogen required by the ‘‘ Urea’? method 
Ae under ‘‘A’’, and that by the hydrazine method, under 
A. B. 
4°35 4°35 
8°7 8°7 
8-7 8°75 
5°8 58 
6°65 67 
etc. ete 
__ It is worth while to note, that in practice, three washings 
with about 20 c.c. of water in each case, are quite sufficient 
to dissolve the nitrous oxide, and the extremely slight solu- 
bility of nitrogen hardly interferes with the result. We can 
very safely recommend it to be used along with the ‘‘ Urea ’’ 
method, if not in preference to it. 
We are at present engaged in investigating the actions of 
the persulphates upon hydrazine and hydroxylamine salts, and 
hope to communicate the results in a short time. 
_ 4n conclusion, we beg to express our thanks to Dr. P. C. 
Ray for his encouragement, and for allowing us to use some of 
his newly prepared Amine nitrites. 
