in alkaline solutions can be interpretated in the light of the basic theory of electrical double layer. It has been found that in strongly alkaline solutions, surface-active agents of the molecular type (Peregal) and the cation type (tetrabutylammonium salt) are adsorbed on the electrode surface within a wide range of potential. Desorption of Peregal occurs only when the electrode is polarized to a potential more negative than -1.8 v (vs. 0.1N C. E.), and its solubility in 10N potassium hydroxide is comparatively large. So it seems to be a promising "addition agent" for controlling electrode processes in concentrated solutions of alkali.