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sulfolane packing, was used continuously for several months a t 35" C. and showed no change in performance.The problem of determining nonhydrocarbon gases has received little consideration in this investigation. At present it is difficult to visualize a column that will separate the uncondensable gases from one another as well as the individual hydrocarbons. A simple cold-trap separation of such samples might provide a hydrocarbon fraction for analysis by gas-liquid partition chromatography and an uncondensable fraction for adsorption chromatography (11). .\nother possible approach is separation of the uncondensable gases in a single fraction with methane by gasliquid partition chromatography, and analysis of this fraction by mass spectrometry. The design of suitable equipment for sampling the effluent gas from the thermal conductivity cell will greatly aid this approach. Such equipment will also be valuable for collecting hydrocarbon components when further qualitative identification is required. ACKNOWLEDGMENTThe authors are grateful to P. E. Porter for the many helpful suggestions made in the course of this work and to G. J. Pierotti 303 for suggesting the use of dimethylsulfolane as a selective stationary liquid for retarding olefins,

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