Amount of silver ion adsorbed on gelatin-free silver chloride precipitate has been determined and the electrical conductivity and the rate of photolysis of the precipitate measured, to know to what extent the adsorbed silver ion influences the electrical and photochemical properties of the precipitate. The maximum number of adsorbed silver ions was estimated to be only about 15% that of surface lattice silver ions of the precipitate. The electrical conductivity of the precipitate decreased, and the rate of photolysis remained almost unchanged, when the precipitate was treated with solutions containing silver ions. These facts suggest that the adsorbed silver ion does not have a larger mobility, and is not a deeper trap for photoelectrons, than the surface lattice silver ion.