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lattice inodes of the platinum and molecular modes of the adsorbed carbon monoxide. Grimley11 has treated the general problem of the vibrations of adsorbed molecules by a method which includes the interactions between lattice modes and molecular modes. In applying his treatment to the data obtained by Eischens' group2•8 he estimated, also neglecting intramolecular interactions, that vi was shifted about 30 cm-1 upward by platinum lattice modes at 156 cm-1, i.e., Grimley's calculation suggests that the unperturbed value of vi lies at about 446 cm-1. When our value of vi is corrected by the same amount, the values 17.01, 3.01, and 1.09 mdynes/A. are obtained for FCo, Fcm, and /, respectively. These values tend toward those obtained by Jones,9 but they still suggest a strong interaction between the platinum crystallites and the adsorbed carbon monoxide.(11) T. B. Grimley, Proc, Phys. Soc. (London), 79, 1203 (1962).

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The viscosities of the quasi-spherical molecules CH4, CF4 and SF6 have been measured using a capillary flow technique in the temperature ranges 293-1 050 K (CH4) and 293-873 K (CF4 and SFs). At the lower temperatures the results are generally in reasonable agreement with those reported by other workers but considerable discrepancies exist at higher temperatures. The effect of the new data on previous conclusions regarding interactions between these molecules is discussed.Recently measured high-temperature viscosity coefficients of the inert gases have confirmed errors of up to 6 % in earlier data.l The new results are in much better

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