It was shown that approximately 60% of the hydrogen yield was independent of temperature and scavengers. The formation of this hydrogen was attributed to unspecified molecular processes. Onehalf of this hydrogen was accounted for by unsaturation and the remainder by dimer forming reactions which were independent of temperature. The remaining 40% of the hydrogen yield was attributed to free radical processes involving H-atom abstraction.The mass spectrum of re-hexane shows mainly C4, Cg and C2 positive ion peaks with only very small C6 and C6 positive ion peaks. The chromatograms, which can be regarded as liquid fragmentation patterns, of irradiated hexane liquid show a large amount of product which must result from the formation of Cg species along with smaller amounts of C2, Cg and C4 species. The marked differences between the mass spectral data and the chemical data can be attributed to the effect of state.Based on the observed product distributions as a function of temperature and scavengers the following primary processes are proposedCeH" -CeH12 -j-H2G (-hexane)1.5 (I) 2C6H,4 -2C6Hi3 + Hz 2.0 (II) CeHu -*CeHi3 + H* 2.0 (III) CeHI4 --Cj• -C*;

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2015read, as was the difference in levels of the legs of the differential manometer. The procedure was then repeated at a higher temperature. RESULTSThe data are given in Table I. The per cent relative humidity was calculated from the aqueous tension by dividing by the vapor pressure of water at the same temperature, as given in International Critical Tables (6). Clausius-Clapeyron plots (log p vs. 1/T) were linear over the temperature ranges studied, and existence of phase transitions was characterized on such plots by abrupt changes of slope. Such transitions are discussed below.

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Mercuration is of sufficient general applicability and importance in the aromatic series tobe regarded as a typical substitution reaction, like nitration, sulfonation, or