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dissociation constants. We thank MY. F. E. Salt and Dr. K. H. W. Turck for their interest in the work described in this series of papers, and the Directors of the Distillers Company Ltd. for permission to publish the results. THE DISTILLERS COMPANY LIMITED, RESEARCH AND DEVELOPMENT DEPT.,

Phenylarsonic acid in hydrochloric acid is readily reduced continuously to phenyldichloroarsine with sulphur dioxide, and an all‐glass apparatus was designed for the production of 30 lb. per hour. This material was then partially hydrolysed continuously by water to a 50/50 mixture of phenyldichloroarsine and phenylarsenoxide which after drying, was continuously at 290‐300° c. in a mild steel apparatus. This stage did not proceed very satisfactorily except at the beginning of the experiments, owns to corrosion of the metal which led to the deposition of a gelatinous form of arsenious oxide stable only above a temperature in the region of 200°C.