1.A method was developed to utilize a 4-element vacuum tube to measure small potential differences.2. The so called photovoltaic e.m.f. appears to be a modification of the electrolyte with light, there being no indication of any effect due to the direct illumination of the electrode or the boundary region between the electrode and the electrolyte.3. In certain types of experiments with these cells, current measurements cannot be regarded as a quantity proportional to e.m.f. 4. The e.m.f. of the photovoltaic cell increases with the concentration of the electrolyte.
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