Chemistry and Physves. . 509 
C 
2d, in presence of the white chloride, this metallic silver reacts to 
give the violet body: 
AgCl+Ag—Ag,Cl. 
the fact is to be ascribed to the production, by the active rays, of 
& new compound, decomposable now by the previously inactive 
ility, it cannot evidently exhibit this continuing action. And, 
since both bromide and iodide are colored yellow by light, they 
nt 
2°8215 grams of the crystalline oxide, A second portion was then 
heated with distilled water to 100°, and the solution kept boiling 
3d * ‘hd 
Prepared by heating the pulverized crystals in a flask, to a high 
temperature, it was found that water which had been agitated, 
Upon the oxide at 15° for 24 hours, contained 0°9306 grm. in 100 
&¢, and 9:306 grms. in one liter. Finally, the amorphous oxide 
