Vol. XI, Nos. 7 & 8.] Action of Light on Silver Chloride. 181 
[V.8.] 
with NH,HO and weighing the residue of Ag. From these data 
he deduced the formula Ag,ClO for the oxychloride. 
that found by Baker. 40 gms. of the pure chloride exposed in 
4500 c.c. bulb after three months gave an absorption of only 
ce. 
Y;- It was found impossible, as a matter of fact, to prepare 
perfectly oxygen-free chlorine this way, and in the first analysis 
allowance was made for the small amount of oxygen in-the 
chlorine, Perfectly pure Cl was subsquently prepared by a 
method given by Wohler v. Streicher (Berichte IL, 1913) by the 
action of HCl on ppted MNO, hydrate. The whole of the appa- 
falls Was composed of glass, the junctions between the jena 
ind ordinary glass parts were made by Baumbach, Manchester. 
q darkened product was placed in a jena tube fitted at either 
> acuum 
except the electrolytic vessel evacuated. Pure dry ch orine 
was then allowed to act on the gently-warmed photochloride, 
and the evolved oxygen measured. 30 gms. of the darkened 
mixture evolved 4 cc. of oxygen 
. Way varied very greatly in different samples and bore no 
“chiometrical relation whatever to the oxygen evolved. 
d he effect of heat on the darkened substance was next 
termined - 
2,6267 gms. were dried 8 hrs. at 110—120°. 
The Weights after successive dryings were as follows :— 
110-120° g hrs. = 2,62655 —0,00015 
150-160° 8 hrs =2,62605  —0,0005 
-210° & hrs =2,62562 —0,00043 
