The absorption of infrared radiation by methanol vapor in the region 3200 to 3800 cm-1 has been studied at 305° and 335°K as a function of vapor density. The results best correlate with the model that methanol vapor is composed of monomer, dimer, and tetramer, with little or no trimer present. The heat of dissociation of the dimer is found to be approximately 3 kcal/mole, and that of the tetramer approximately 17 kcal/mole. The greater stability of the tetramer compared to the dimer is consistent with a cyclic structure for the tetramer.

A difficult analytical problem was solved by combined use of several techniques to assay products from the liquid phase oxidation of paraffins. The method provides a quantitative measure for six classes of oxygenated compounds in the C12-C15 carbon number range. The procedure can be modified to handle mixtures outside of this molecular weight range. Samples are first separated into hydrocarbon and oxygenated compound fractions by elution through silica gel. The two fractions are then analyzed by com-

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