Abstract
IN the recent issue of the Proceedings of the Royal Society (A, 124, 554; 1929), H. J. Phelps and R. A. Peters, while studying the adsorption of some organic acids on pure charcoal as a function of the hydrogen ion concentration, come to the conclusion that, in the given conditions, the non-dissociated molecules and not the corresponding anions are adsorbed. This conclusion is based on similar observations to those already made by R. Wurmser and myself some years ago (C.R., 179, 972; 1924) with another charcoal, that, while for different acids there is no relation between adsorption and dissociation, in the case of the same acid, there is a very definite relation between these two phenomena; and I am very glad to see our results confirmed and enlarged by the interesting work of Messrs. Phelps and Peters.
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