Abstract
We derived the T=V/V0, relation at zero pressure for molecular crystals by taking the Einstein model and assuming the interatomic potential form of Lennard-Jones type, and found that the curve has a maximum of T, which may naturally be supposed to be intimately connected with the melting temperature. Calculated actually with several substances, the maximum values were found to lie fairly near the melting temperature. But if we regard it as a melting temperature, we go too far. To deal with the melting process rigorously we need to know the free energy of the liquid state also besides that of the solid state, but in spite of various attempts satisfaitory results are not yet obtained. The comparison of TMax with the melting temperature is summed up in Table V
