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crystal containing the glassy characteristics. Vr defined as the increment to the hypothetical crystal is not as good a factor for o-terphenyl as for the o-TP/TPCM mixture, and the glass transition of o-terphenyl cannot be regarded as a quasi-equilibrium second-order transition of the Ehrenfest type. The Adam-Gibbs parameter is not effective for o-terphenyl. For a summary of the present series,2,3 we may be allowed to state that the thermody-namic factor governing the molecular mobility of molecular liquids including polymer liquids is the configurational internal energy or the configurational entropy.Acknowledgment. We are grateful to Hironobu Okumura and Kouji Ujita for helpful correspondence.

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