The general interest in the theoretical and practical study of the adsorption of gases and vapours in flo+r systems,in contrast to the classical static methods,is steadily increasing.It soems that mainly the spreading of contact catalytical industrial processes requires roliable adsorption and reaction kinetical measurements on the same flow systems,under possibly identical conditions of flow,pressure and femperature.Sipco tlio earlier dynar}ica,l methods for measuring adsorption wero appreciably less precise than the static ones,they were applied but to a little oxtent.However,recent developments in chromatography,and mainly in gas chromatography,made it possible to)volve quite sensitive dynamical methods of measurement.