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54,2628 (1976). During the oxidation of malonic acid by potassium bromate catalyzed by the Ce(II1)-Ce(1V) couple in a sulfuric acid solution, concentration oscillations of ceric and bromide ions are observed. This reaction, discovered by Belousov, can be resolved into two parts: reduction of bromate by cerous ions and oxidation of malonic acid by ceric ions. The former shows very unusual kinetic features and its mechanism is the basis of the explanation of the oscillations. It is autocatalytic but inhibited by bromide ions. We have thus reinvestigated this reaction varying not only the initial concentrations of bromate and of cerium but also that of bromide. The mechanism suggested involves, besides the classic steps of the bromate-bromide reaction, the oxidation of cerous ions by BrO,' radicals produced by the step HBrO, + Br,02 = 2Br0,' + Br-+ H+

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