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An investigation was made to examine the rate of transmission of hydrogen through metals, both exothermic and endothermic hydrogen occluders, and from this examination to elucidate the mechanism of the process. In the case of palladium it is shown that, on an anodically activated surface in aqueous solution, the transmission is almost exclusively controlled by the diffusion through the bulk metal. However, the jump of a hydrogen atom from the metal surface to the interior of the metal is the next slowest step in the process. Using another method work was done with alloys of palladium and silver, 20% and 30% silver by weight. The results obtained with these alloys does not appear to agree with the observations of other investigators and this work will have to be extended and rechecked.