The spectra of anaerobic solutions of the (1:1) cobalt(II)-trien complex have been measured in aqueous solution from pH 7.5 to 12.6. The (reversible) change from a pink to a striking grape-colored solution in the more basic media is ascribed to the transformation of Co(trien)(H2Q)22+ (1A), €484max 8.0, e160sh 6.6, into a monohydroxylated species (IB), e545max 30.2 and e5mah 25.0. For this process

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Eosung." This solution had been previously recommended by Smith,2 and his observations were confirmed by Freudenberg.2 The results recorded in the preceding paragraphs justify us in saying that cadmium can be successfully determined electrolytically when working either with its acetate or sulphate, and that its separation from copper in the presence of nitric acid is in every respect satisfactory.The failure of Heidenreich to precipitate uranic oxide by means of the current will be considered later. Universityof Pennsylvania.ON THE REACTIONS BETWEEN FIERCURY AND CONCEN-TRATED SULPHURIC ACID.

U,08 and ZrO,, is fused with six to seven grams sodium bisulphate and the melt dissolved in cold water. The solution is mixed with fifty cc. hydrogen peroxide and poured into a casserole containing five grams pure sodium hydroxide dissolved in fifty cc. water and fifty cc. hydrogen peroxide. No precipitate forms at first, but after heating on the water-bath for a half hour the zirconium oxide settles to the bottom of the dish as a very heavy precipitate which is filtered and washed with hot water. The precipitate is easily dissolved by a warm mixture of hydrochloric acid and hydrogen peroxide. This solution is boiled, precipitated with ammonia, washed at first with ammonium nitrate solution, then with water, ignited, and weighed as ZrO,.Zirconium dioxide taken. Zirconium dioxide found.Difference. 0.2150 0.2158 +0.0008In conclusion the author wishes to state that this work was suggested to him by Prof. Dr. P. Jannasch, of Heidelberg, over a year ago, and much of the work was done in his laboratory, but as the results then obtained were not entirely satisfactory, it was not published at that time.