(1) The oxidation velocity of sodium sulphite was studied, when the condition is satisfied, under which the concentration of oxygen in the boundary surface layer is always zero. The oxidation velocity is independent of the concentration of sodium sulphite and is proportional to the boundary surface area. (2) The theoretical considerations on the observed oxidation velocity was given. (3) The assumption that only the molecule of oxygen, whose component of velocity vertical to the boundary surface is greater than a threshold value u0 is able to enter into the liquid phase, was given, and the values of u0 were calculated at 15°C., 25°C. and 35°C. from the experimentally obtained result. The calculated value of u0 is 1.65×105 cm. per sec. and is independent of the temperature within the observed region.
1. Chloro-choline chloride was obtained by the condensation of trimethylamine with ethylene chloride. It decomposes slowly above 163°C. melting and boiling, at 242°C. with a reddish brown discoloration. 2. Thio-choline chloride was prepared from chloro-choline chloride by the action of 2-thio uracil at 150°C. Its isoelectric point was found to be at PH 7.0. It decomposes slowly above 200°C. (approximately), melting and boiling at 238°C. 3. Thio-choline chloride reacts with silver chloride to form (Remark: Graphics omitted.) whose solubility in water at 37° was found to be 0.1215 gr. It decomposes slowly above 70°C. (approximately), melting and boiling around 228°C.