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Since the summary referred to above was published the problem has been studied by Lewis and Storeh,3 Linhart,4 Sherrill and Izard,5 and Griffith, McKeown and Winn.6 All of the authors depend on the method first used by Jakowkin, which consists in distribution experiments in which bromine is distributed between carbon tetrachloride and water or an aqueous solution of a bromide. In general these later authors confirm and extend the earlier measurements of Jakowkin.However, Jakowkin's method has serious