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In order to understand metabolism better the behavior of the different fuelstuffs under various conditions outside the body must first be investigated. A series of studies in this direction was accordingly started, particularly on the physico-chemical behavior of the sugars (1-7). In a preceding investigation by Mathews and the writer (7), the following conclusions were drawn regarding the oxidation of glucose by bromine: (a) Glucose behaves both as a weak acid and as a weak base. In an alkaline or neutral solution it dissociates into metal or Hf ions and C,H,,O,ions; in an acid solution it forms a salt of the acid by addition, yielding C,H,,O,+ ions and the anion of the corresponding acid. (b) Both of the glucose ions are oxidized by bromine side by side, the oxidation of the first being depressed by the addition of H+ ions, while the other remains unaffected. Velocity equations were worked out on this basis, taking into consideration the two kinds of glucose ions, the concentration of the H+ and OHions and of the bromine and the hypothesis was tested under very diverse conditions by measuring the rate of oxidation in the presence of various acids in different concentrations and varying amounts of bromine. The hypothesis was found to agree with all the facts observed. In the experiments just cited the concentration of the sugar was purposely taken SO large that its change of concentration was negligible. It seemed necessary, therefore, to vary also the

THE MECHANISM OF THE OXIDATION OF GLUCOSE BY BROMINE IN NEUTRAL AND ACID SOLUTIONS.