Societies and Academies

Abstract

PARIS. Academy of Sciences, August 5.—M. Fouqué in the chair.—On Poisson's theorem and on a recent theorem of M. Buhl, by M. Paul Appell. The theorem of Buhl is a particular case of Poisson's theorem.—The law of pressures in cannon, by M. Vallier.—New method of preparing aniline and its analogues, by MM. Paul Sabatier and J. B. Senderens. A mixture of hydrogen and nitrobenzene vapour is passed over reduced copper kept at a temperature of from 300°–400° C., the yield of aniline being nearly theoretical. If nickel is employed instead of the copper, the reaction goes farther even at 200°, benzene and ammonia being produced-On the luminous variation of the planet Eros; curves of light; amplitude of the variation, by M. Ch. André.—On the infinitely small deformation of a spherical elastic envelope, by MM. Eug`ene and Francois Cosserat.—On a relation which probably exists between the characteristic angle of deformation of metals and the Newtonian coefficient of restitution, by M. G. Gravaris. The characteristic angle of deformation (a), and the Newtonian constant of restitution (e), appear to be related according to the equation πe=2a.—Critical study of the general theory of mechanisms, by M. G. Kœnigs.—On disruptive discharge in electrolytes, by M. K. R. J ohnson.—Remarks on a communication of MM. A. Broca and Turchini.—The electric capacity of the human body, by M. G. de Metz. It follows from the experiments described that it is illusory to compare the electric capacity of the human body with that of an ellipsoidal conductor. The same person may possess several capacities according to the conditions under which he is placed. The average figure found is about 0.00011 microfarad.—The difference of potential and the deadening of the electric spark with oscillatory character, by M. F. Beaulard.—On the transmission of Hertzian waves through conducting liquids, by M. Charles Nordmann. For the liquids studied (solutions of sulphuric acid, common salt, potassium chloride and magnesium sulphate), the maximum thickness which could be traversed by the waves employed, that is to say, the transparencies for the waves, varies in the same sense as the resistances, but not in proportion.—The vapour tension of solutions. The hypothesis of Arrhenius, by M. A. Ponsot.—An attempt at an immediate analysis of nervous tissue, by M. N. Alberto Barbieri.—On the cycloplasmic maturation, by M. Yves Delage.—Carboniferous goniatites in the Sahara, by M. Collot. The discovery of goniatites in the carboniferous layers of the Sahara points to an age a little more recent than that deduced by M. Ficheur, and it shows further that there were several levels, amongst which that which furnished the goniatites may be contemporaneous with the layers observed by Foureau in the Tassli Adzjer.—A physiological photometer, by M. G. M. Stanoïévitch.