Abstract
The behaviour of the zeolites on dehydration, and their capacity for absorbing other gases and vapours in place of the water removed, have formed the subject of numerous investigations, qualitative and quantitative, of various degrees of accuracy. In only a few cases have attempts been made to fit an equation to the experimental data. Of these equations, those proposed by O. Weigel, G. F. Hüttig, and O. Schmidt are quite inadequate, as is readily seen by a trial with the more extensive data now available. On the other hand, E. Rabinowitsch derived an equation which proved capable Of reproducing the experimental data and is very similar to the equation now proposed, but derived in a quite different way.

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