Abstract
Formulae are given for the specific heat and the magnetic susceptibility of a crystal, calculated on the assumption that the interaction between magnetic atoms is a sum of the anisotropic (direct or indirect) exchange interaction and the magnetic interaction. These formulae are applied to the case of copper potassium sulphate which has been investigated experimentally by De Klerk at temperatures below 1°K. Unfortunately, no unambiguous theoretical conclusions seem to be possible.
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