152 Journal of the Asiatic Society of Bengal. [ April, 1906. 
0°5770 gms. gave 10°l ce nitrogen at 28° © and 7625 mm. 
pressure ; N=1-92 per cent. 
These figures indicate that only one quarter of the oxygen 
contained in the dioxide reacts with ammonia with the formation 
of water and nitrogen, according to the equation— 
6Ag,O, a 2NH, = 3Ag,0, + 3H,0 + N,. 
and then the Ag,O; reacts with a further quantity of ammo- 
nia without the liberation of any gas to produce a soluble com- 
pound, perhaps of the form m Ag,O,, n 3° 
According to this equation, Ag,O, would cause the evolution 
of 1°88 per cent. of nitrogen. 
It is usually stated in the text-books that silver dioxide reacts 
with ammonia according to the equation— 
3Ag,0, + 2NH,; = 3Ag,0 + 3H,O + Ny. 
This, apparently, is based on the investigation of silver peroxy- 
nitrate by Bottger (loc. cit.). 
It would be desirable to investigate the soluble compound 
formed in this reaction, as it appears that in this compound also 
the silver must exhibit a valency greater than unity. ; 
The solution of silver diowide in strong nitric acid.—The dioxide 
dissolves in cold, strong nitric acid with the production of an in- 
tense brown-colored solution. 
pct of the spectrum except in the red of smaller wave 
ength, the yellow and the green, The color of the solution 18 
co 
‘ordinary temperature. On the first addition of concentrated nitric 
tion over soda-lime in a vacuum at the ordinary temperature was 
unsuccessful, 
The rate at which the colored compound decomposed was 
studied by keeping a test-tube containing the solution surrounded 
by a beaker of water to keep the temperature steady, and noting 
