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selenic acid has been developed, as well as one for the detection of small amounts of sulfuric acid i c the presence of selenic acid.-+. It has been demonstrated that the electrolysis of selenic acid or of its salts under conditions favorable to the formation of persulfates from the analogous compounds of wlfur yields neither perselenic acid nor perselenates.5. The dehydration of crystalline copper selenate was studied and the temperature of its complete dehydration was determined. .A method for the determination of selenium in selenates by the use of hydrazine hydrate is described.7. The preparation and properties of three new ammonates of copper selenate are described. ITEACA, X , I ' . [CONTRIBUTION FROM THE KENT CHEMICAL LABORATORY OF THE UNIVERSITY OF CHICAGO.