150 Journal of the Asiatic Society of Bengal. [April, 1906. 
x , 
about 18 gms. could be prepared in one operation of 30 minutes. 
A weighed quantity of the substance was boiled with excess of 
distilled water in a beaker for 1} hours, the water being replaced 
as required. The insoluble portion was filtered off, washed with 
hot distilled water, dissolved in hot dilute nitric acid, and the 
silver in this solution estimated by precipitating and weighing 
as silver chloride. 
The silver in the filtrate was also estimated in the same way. 
0°6557 gms. gave 0°5968 gms, silver chloride from the insoluble 
residue: insol. Ag = 68°50 per cent. 
0°6842 gms. gave 0°6186 gms. silver chloride from the insoluble 
residue; and 0°1015 gms. silver chloride from the filtrate ; insol. 
= 68°05 per cent. ; soluble Ag = 11°17 per cent, 
Ag;NO), requires insol. Ag = 68°49; soluble Ag = 11-42per 
cent, iiss 
In another experiment, the gas evolved during the reaction 
was collected and was recognised as pure oxygen from the fact 
that it was completely absorbed by alkaline pyrogallol solution. 
For collecting the gas the following apparatus was employed :— 
the delivery tube was closed. A Spepon of the peroxynitrate was 
t 
was then again heated, the stop-cock on the delivery-tube opened, 
and the oxygen, liberated from the reaction, was collected over 
w 
ture 
over soda-lime in a desiccator or in the steam-oven, It is a dull or 
greyish-black powder. ‘Two determinations of the specific gravity, 
with about 2 gms. of the substance in a specific gravity bottle, 
‘Mains, Ag.O, = 2Ag + O,, 
: The percentage of silver in the compound has been deter- 
aii by heating a weighed quantity and weighing the residual 
ar wot gms. gave 06475 gms. residual Ag: Ag = 
