The electrical resistivity has been measured from 1.3°to 20°K on solid solutions of Ce, Nd, Gd, Tb, and Ho in Au. It was found that the resistivity decreased monotonically with decreasing temperature with no evidence of a resistance minimum. However, for the Gd, Tb, and Ho in Au alloys, the resistivity showed a pronounced decrease in the temperature range 3.5°to 6°K. These results are discussed in terms of the Kondo theory. It was also found that the residual resistivity (4.2°K) is proportional to the concentration of rare earths for the Gd, Tb, and Ho alloys. Furthermore, the proportionality constant is the same for the three sets of alloys, indicating ionic (trivalent) scattering as the main contribution to the residual resistivity. © 1968 The American Institute of Physics.