148 Journal of the Asiatic Society of Bengal. [April, 1906. 
from the sulphuric acid solution, Up to the present, attempts to 
isolate these per-salts have been uniformly unsuccessful. During 
evolution occurs. This gas is no doubt oxygen. There is not — 
formed any hydrogen peroxide during the decomposition, 
SEs oy 
dt 
where x = concentration of the colored compound in the solution 
= time 
k = a constant 
or t=A lg?x +B 
where A and B are constants. 
These observations are not in agreement with the supposition 
that the colored compound has the simple formula Ag(NOs); 
rally be first assigne® to it, The formula 
[Ag(NOs).], or Ag,(NO,), satisfies the requirement that the 
substance shall decompose according to a unimolecular reaction 
Ag,(NO,), — 2H,0 = 4AgNO, - 4HNO, - O;. 
This requirement is also satisfied by Ag,(NO,), decomposing 
us :— 
Ag,(NO,), = 2AgNO, + O,, 
The question of the constitution of the soluble colored com- 
pound is, however, still under investigation. 
EXPERIMENTAL, 
Preparation of Silver perowynitrate electrolysi. 
: ysis of aqueous 
silver nitrate solution.—In Expt. I, the oe nitrate solution was 
great length, 
nok wecessary to use a porous cell to separate the products of thé 
two eleetrodes. The silver nitrate was contained in a small beaker 
