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A large number of cases of oxygen activation or induced oxidation has been described some time ago by W. P. Jorissen I ) . A review of the quantitative results in this branch is to be found in a paper by W. P. Jorissen and A. H. Belinfante*). In this communication there are also given the results of extensive investigations with sodium sulphite as inductor while the followina substances were employed as acceptors : indol, mannitol, n-propyl alcohol, glycol, cis-cyclohexane diol (1.2). trans-cyclohexane diol (1.2), inositol, -Seignette salt, glycerine, erythritol, fructose, saccharose.The first qualitative observations on induced oxidation in which sodium sulphite is the inductor were carried out by F. Mohr3), who noticed the simultaneous oxidation of a solution of arsenite and by C. Wicke "). who observed the oxidation of nickel hydroxide under these conditions. The first mentioned case was investigated quantitatively by W. P. Jorissen5), the latter case by F. Haber and F. Bran6). After the present writer had investigated, both titrimetrically and manometrically, the oxidation of sodium antimonite as acceptor quantitatively ' ) and also of sodium arsenite (in solutions of different degrees of alkalinity) 8), there followed the researches of S. I. Vles g ) , who determined the ratio between the amounts of oxidized sulphite and oxidized arsenite under various conditions (for various values of pH).For an extensive review of the various factors which exert an influence on the oxidation of sulphite solutions reference may be ') The principal results of my dissertation, Leiden, July 8th, 1930. 1) Chem. Weekblad 1, 789 (1904). )Rec. trav. chim. 48, 71 1 (1929).