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Previous authors have shown that evaporated and sintered lead films take up gas phase H atoms to a maximum bulk composition PbH(0.19) at room temperature. The authors recently confirmed by electrochemical and radiochemical experiments that hydrogen and tritium atoms, generated electrochemically at the cathode face, diffuse through a lead foil with a diffusivity comparable in magnitude to that of H in Pd. Their data refer without doubt to bulk Pb but may be too low by one or more orders of magnitude, because of the experimental difficulty of excluding O2 completely. They now report that the electrode capacity, C, of a lead cathode in 1M HClO4 has been found to increase with time of electrolysis.