895.    FERGUSSON, R. R., AND BARBER, R. M.  Derivation and Development of Huttig’s Multilayer Sorption Isotherm.  Trans. Faraday Soc., vol. 46, 1950, pp. 400-407; Chem. Abs., vol. 44, 1950, p. 9768.

      Statistical derivation is given of a generalized sorption isotherm based on evaporation-condensation properties of a sorbed molecule.  Characterictic isotherm equations were obtained analogous to the various modifications of the Brunauer, Emmett, and Teller isotherm (abs. 389).  Isotherms of types I, III, and to some extent V, are obtained but not types II and IV.  A major objection to this and the Brunauer, Emmett and Teller treatment of multilayer sorption is the lack of interaction laterally with molecules in adjacent columns, although interaction with molecules in the same column is permitted.