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The specific heats of palladium and sodium were measured between helium and hydrogen temperatures, the specific heats of mercury between helium and liquid air temperatures. Palladium shows a very high electronic term of the specific heat. Sodium exhibits anomalous behaviour in various respects. In the case of mercury a search was made for a transition at low temperatures predicted by Bridgman, but no indication was found.
Pickard et al. (Thu,) studied this question.