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The photovoltage developed between the surface of a single crystal of photo-conducting CdS and a metal reference electrode has been measured as a function of wavelength and temperature. By comparing the photovoltage in the 1.3-1.6 mu m region with photocurrent measurements made under similar conditions it is shown that the same bulk states are involved in both phenomena. Thus, it is necessary to explain the photovoltage in this region in terms of an indirect mechanism rather than a direct excitation of electrons into or out of surface states.