2.The reaction is explained, after the suggestion of Freundlich and Nathansohn, as one of a 2-stage photochemical oxidation of hydrogen sulfide to colloidal sulfur and a thionic acid, accompanied by reaction between hydrogen sulfide and the thionic acid which serve as stabilizing electrolytes for micelles of arsenic trisulfide and sulfur, respectively. Removal of the stabilizing electrolytes produces destabilization of the 2 colloids which are consequently precipitated. The increase in conductivity is explained as due to the building up of a concentration of the thionic acid sufficient to serve as the stabilizing electrolyte for the colloidal sulfur, the reaction between hydrogen sulfide and the thionic acid then proceeding a t such a rate that the equilibrium is maintained between the several components of the system, further change in the conductance thus being prevented.

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solution were dried over sodium sulfate and evaporated.The semi-solid residue was triturated with 100 ml. of 10% potassium hydroxide, filtered and washed with water. The combined filtrate and washings were extracted twice with chloroform and acidified with 25 ml. of hydrochloric acid. Extraction of the acid solution with five 125-ml. portions of chloroform gave a further 6.3 g. of crude a-mercaptobutyramide; total yield 7.5 g. (42%); m.p. 81-91°. It was not purified further in order to avoid partial oxidation to the disulfide.

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