for making available spectroscopic data which were essential to this investigation. The assistance of Mr. Robert Robinson in some of the experimental measurements is gratefully acknowledged. Bartlesville, Oklahoma [Contribution No. 28 from the Thermodynamics Laboratory, Petroleum Experiment Station, Bureau of Mines]

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Low temperature calorimetry and vapor flow calorimetry were repeated for toluene with current accurate niethode to provide the following information: values of heat capacity for the solld ( l l°K . t o the triple point), the liquid (triple point to 371'K ), and the vapor (371 to 500°K.); the triple p i n t temperature; the heat of fusion; thermodynamic functions for the solid and liquid (0 t o 360'K.); heat of vaporlaation (341 to 410°K.); and parameters of the equation of state. The results were used to confirm a vibrational assignment and t o show that the internal rotation is essentially free, 8s expected from the sixfold symmetry. Thermodynamic functions for toluene in the ideal gas state ( 0 to 1600°K.) were calculated by methods of statistical mechanics.