Abstract
PARIS
Academy of Sciences, October 2,—M, C. Jordeii read a mathematical paper "On the Classification of Primary Groups.“Two papers on subjects connected with physics were read, one by M. A. Cornu, "On the Determination of the Velocity of Light,“in which he suggests an improvement in the method proposed by Fizeau for this purpose* and a note by M. G. Salet on the Spectra of Tin and its components, which he describes as the most singular he has ever seen.—On astronomical subjects several communications were made.-M. Chasles replied to a statement made by M. Bertrand at a previous meeting with regard to Aboul Wéfa's method of calculating the position of the moon. M. Y von Villareau communicated a long paper, full of mathematical formulas, “On the Determination of the true Figure of the Earth, without the necessity of actual levellings."—M. Delaunay read a note on the two recently discovered planets, Nos. 116 and 117, in which he indicated that the planet discovered at Versailles by M. Borelly, and named Lomia, must be numbered 117, as the planet discovered by M. Luther two days afterwards had been previously detected in America by Mr. C. H. F. Peters.— Letters on these planets by MM. Luther and Peters were also communicated by M. Leverrier, and M. Delaunay presented a determination of the orbit of Lomia by M. Tisserand.—The same gentleman a note on the nebulas discovered by M. Stephan at Marseilles, and a note by M. Loewy on a new equatorial instrument. The latter is mounted like a transit instrument, but its body is bent at a right angle, and the images are carried to the eye of the observer by means of prisms or mirrors. The advantage, according to the author, is that the observer can carry on his investigations without changing his place, and that the necessity for an expensive revolving dome is done away with. —A fourth letter from Father Secchi, on the protuberances and other remarkable portions of the surface of the sun, was read. It contains a classification of the phenomena in question, and notices the chromosphere, protuberances, and clouds. Of the second several kinds are described.—M. de Fonvielle presented the programme of an intended balloon-ascent for the purpose of noticing the meteors of November 1871, and MM. Regnaultand Elie de Beaumont made some remarks upon the same subject.— A letter was read from M. A. Poéyon the law of similar evolution of meteorological phenomena, in which he indicates the existence of a connection between the periodicity of meteorological phenomena and the diurnal and annual movements of the earth.— M. G. Lemoine presented a second part of his investigation of the reciprocal transformation of the two allotropic states of phosphorus, and M. Berthelot a second part of his researches upon ammoniacal salts. In the latter the author treats of the compounds of ammonia with boracic and carbonic acids.-A paper was read by M. C. Mene, giving numerous analyses of clays belonging to the carboniferous formation.-The tables of meteorological observations made at the Paris Observatory during the month of September was also communicated to the meeting.
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Societies and Academies . Nature 4, 498–500 (1871). https://doi.org/10.1038/004498b0
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DOI: https://doi.org/10.1038/004498b0