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Academy of Sciences, October 16.—M. Chasles commu“I nicated some theorems concerning the determination of a series of groups of points ona geometrical curve.—M. P. A. Favre read a continuation of his thermic investigations upon voltaiG energy, in which he described the results obtained under various conditions with batteries consisting of a plate of the alloy of palla* dium and hydrogen in dilute sulphuric acid and of a plate of platinum in solution of sulphate of copper. He tabulates his results, and also gives the results of experiments on the electrolysis of the acids employed.—M. Lecoq de Boisbaudran presented a memoir on some points of spectrum-analysis and on the constitution of induction-sparks.—M. F. M. Raoult presented a memoir giving the results of investigations of the calorific coefficients of the hydro-electric and thermo-electric currents, from which he concludes that the heat evolved by an electric current is independent of the nature of the battery employed, the calorific coefficient K<? being the same for all sources of voltaic electricity.—M. Delau-n *y noticed the reappearance of Tuttle's comet, which was discovered at Marseilles by M. Borelly on the night of the 12th-13th October. The reappearance of this comet at the time calculated, is important as confirming its supposed identity with the second comet of 1790.—M. Chasles replied to the remarks made by M. Bertrand at the last meeting on the subject of the Arabian astronomer, Aboul Wéfa.—M. Berthelot communicated a further note on his researches upon the ammoniacal salts of the weak acids, relating chiefly 'to certain thermic phenomena observed when a solution of carbonate of ammonia is mixed with solutions of other alkaline carbonates.-A note by MM. C. Friedel I and R D. Silva on the action of chlorine upon various bodies of the series in C3 and on the isomers of trichlorhydrine was read.— M. Marey communicated a note on the duration of the electric discharge in the torpedo, in continuation of a note presented by him to the last meeting.
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Societies and Academies . Nature 4, 519–520 (1871). https://doi.org/10.1038/004519a0
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DOI: https://doi.org/10.1038/004519a0