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urements was 0.1 lower than the value found by several investigators from measurements in solution, although the solvent effect, which, in the case of chlorobenzene, lowers the solution value to such an extent that the gas value is 10% higher than that measured in solution, should lead to a similarly lower value for o-dichlorobenzene.9 Since addition of 10% to the solution value, 2.27, for o-dichlorobenzene gives a value, 2.50, practically identical with the newly determined gas value, 2.51, in Table II, it is evident that there is no anomaly in the solvent effect for this compound.The writers wish to express their thanks to Professor C. E. Boord of Ohio State University and Dr. George Calingaert of the Ethyl Gasoline Corporation for the xylenes and to Dr. P. D. Hammond of the Heyden Chemical Corporation for the o-dichlorobenzene used in this investigation.

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