Page:Proceedings of the Royal Society of London Vol 4.djvu/405

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The reading of a paper, entitled " Contributions to the Chemical History of the Compounds of Palladium and Platinum." By Robert Kane, M.D., M.R.LA., communicated by Francis Baily, Esq., V.P.R.S., was resumed and concluded.

The author states it to be his object, in this and in some subse- quent papers, to examine specially the composition and properties of the compounds of palladium, platinum, and gold ; and to ascertain how far they agree, and in what they differ, as to the laws of com- bination to which these compounds are subjected. He commences with the investigation of the compounds of palladium, employing for that purpose a portion of that metal with which he was furnished by the Royal Society out of the quantity bequeathed to the Society by the late Dr. Wollaston. He describes the mode of obtaining the protoxide of palladium, and enters into the analysis of the hydrated oxide, the black suboxide, and the true basic carbonate of that metal ; detailing their properties and the formulae which express their mode of composition. The chlorides of palladium form the next subject of inquiry ; and the author concludes from his experiments that the loss of chlorine which the protochloride undergoes, when kept for some time in a state of fusion at a red heat, is perfectly definite ; and also that the loss represents one half of the chlorine which the salt con- tains. But in the double salts formed by the protochloride of pal- ladium with the chlorides of the alkaline metals, he finds that the similarity of constitution usually occurring between the compounds of ammonium and potassium is violated. From his analysis of the oxy chloride of palladium the author concludes that it is quite ana- logous to the ordinary oxychloride of copper. He then examines a variety of products derived from the action of a solution of caustic potash on solutions of ammonia-chlorides of potassium. Their properties he finds to indicate analogies between palladium and other metals, whose laws of combination are better known. The sulphate, the ammonia-sulphates, the nitrates, and the ammonia-ni-