Abstract

PARIS.Academy of Sciences, August 24.—M. Duchartre in the chair.—Remarks on the dynamic conditions of the development of cometary tails, by Dom Et. Siffert.—Résumé of solar observations made at the Observatory of the Roman College during the second quarter of 1891, by M. Tacchini.—On cyclic systems, by A. Ribaucour.—A property of involution, common to a group of five right lines and a system of nine planes, by M. P. Serret.—On the tension of water-vapour up to 200 atmospheres, by M. Ch. Antoine. From the expression deduced from the experimental results of MM. Cailletet and Colardeau, the author deduces formulæ for the calculation of P to a first approximation, by the aid of the general formula , given by J. Bertrand to express the tension of vapours. The formulæ given are:—

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