The specific heats of cadmium and magnesium have been measured in the temperature range 0.4° to 1.5°K. For cadmium the electronic specific heat coefficient γ is 163.6±2.6 μcal deg^-2 (gat.)^-1, the Debye temperature θ is 204±3°K, and the superconducting transition temperature is 0.52±0.01°K. For magnesium γ is 292.7±2.5 μcal deg^-2 (gat.)^-1. These results show that a previously reported discrepancy between the elastic and thermal values of θ for the hexagonal metals was due to incorrect interpretation of specific heat data.