1) The author found the apparent external photoelectric effect of sulphate and nitrate of heavy metals which were considered not photoelectrical. 2) Aqueous solutions of inorganic salts except ferrocyanide have been considered to be photoelectrically inactive, but the author found many photoelecrical aqueous solutions of inorganic salts which will be reported later in datail. The reason for the author's finding the apparent photoelectric effect of the substances which have been considered not to be photoelectrical, may be attributed to the fact that his apparatus is more sensitive than other investigators'.
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