The potential of Ag-Pd alloys decreases, during absorption of hydrogen from aqueous solutions, to a value characteristic of the alloy, and after a time at this value, it drops gradually to zero. X-Ray studies of Ag-Pd alloys charged with hydrogen show that the potential plateau corresponds to an-ß transformation similar to that found with the H-Pd system. Alloys containing 30% or more silver do not show a potential plateau during the absorption of hydrogen, and the X-ray studies indicate that a continuous expansion of the lattice occurs in this case. The lattice parameter-potential diagrams for H-Ag-Pd alloys of varying silver content essentially coincide once the/3-phase is formed although the concentration of dissolved hydrogen is substantially different for each alloy. These results are discussed in terms of a model according to which dissolved hydrogen exists as protons with the corresponding electrons going into the d-band of the alloy.