Dec., 189o.] C/zemical Section. 483 with purpureo-cobaltic chloride, L e., the product was evidently cobalt sesquisutphide. Of the cobalt amines examined, the roseo-derivative was most rapidly changed by the gas. We have good reasons for believing that we can make this reaction serviceable in the determination of cobalt in these bases. PUReUREO-CHI~OMIC CHLOI~IDE (ChCln, IoNHa).--We exposed this salt for a long period, in the cold, to the influence of hydrogen sulphide, without its sustaining

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... y alteration. On raising the temperature so that it was slightly lower than the dissociation temperature of hydrogen sulphide, the purple-colored amine became quite black in color. It had a velvety appearance and resembled the chromium sesquisulphide obtained by other methods. (I) 0"6390 gram substance gave o'264o gram sulphide. The theoretical amount should be 0"2629 gram. When this sulphide is exposed to a high heat in a current of hydrogen gas, it parts very slowly with its sulphur. It is our intention to apply this reaction to other metallic amines as soon as we can do so, though at present our work has been interrupted by unforeseen circumstances.