Abstract
PARIS.
Academy of Sciences, July 15.—M. Hermite in the chair. New studies on the rotation of the sun, by M. H. Faye. An account is given of Dr. Wilsing's observations of faculæ for the purpose of determining the time of rotation, and of the recent work done by M. Dunér, in which Fizeau's method was adopted.—On the photography of the polarization fringes of crystals, by MM. Mascart and Bouasse. A method of obtaining photographs of these fringes is described.—On the freezing of meat by cold liquids, by M. Th. Schlœsing. A new method for freezing and preserving large quantities of meat is described.—The active elasticity of muscle, and the energy used in its creation, in the case of dynamic contraction, by M. A. Chauveau.—On linear differential equations, by M. Gels.—Method of measuring the difference of phase of the rectangular components of a refracted light-ray, by M. Bouasse.—On the measurement of the vapour-tension of solutions, by M. Georges Charpy. The author uses the condensation hygrometer to determine indirectly the tension of the vapour above the solution employed.—On the laws of Berthollet, by M. Albert Colson.—Researches on the double nitrites of rhodium, by M. E. Leidié. Double nitrites of rhodium and potassium, sodium, ammonium, and barium respectively are described, methods of preparation and properties of each salt being given.—On some combinations of camphor with phenols and their derivatives, by M. E. Léger. Many of the compounds obtained yield crystals of definite form and constant composition, and are hence proved to be true compounds. —On mannite hexachlorhydrin, by M. Louis Mourgues. The method of preparation and properties of this body are given; its analysis indicates that it possesses the formula C6H8C16, Raoult's method gives its molecular weight as 278; the writer is of opinion that its constitution corresponds to CH2C1(CHC1)3CH2C1.—On some new derivatives of β-pyrazol; a contribution to the study of the nitric ethers, by M. Maquenne.—Researches on the division of the embryonic cellules among the Vertebrata, by M. L. F. Henneguy.—On the colouring reagents of the fundamental substances of membrane, by M. L. Mangin, The author compares the action of colouring matters of membrane with their chemical ocomposition, and establishes the results furnished by the colouring reagents by chemical analyses of the tissues.—On the expansion of silica, by M. H. Le Chatelier. The experiments show that amorphous silica expands very little between 600° C. and 1000° C. Quartz expands regularly up to nearly 600°, and then reaches a point where increase of temperature causes contraction. Calcined chalcedony expands slowly up to 200°, then the coefficient of expansion is enormously increased for a time, but finally it returns to the original value. Tridymite behaves much like chalcedony, expanding slowly up to about 120°, when an abrupt change takes place; the slow expansion then returns again, and finally contraction takes place with increase of temperature. Thus the change in the coefficient takes place at a higher temperature in the minerals of high density (quartz, chalcedony) than for those of lower density (tridymite and calcined chalcedony).—Analysis of the menilite of Villejuif, by M. Auguste Terreil.—On the prediction of storms by the simultaneous observation of the barometer and the higher atmor spheric currents, by M. G. Guilbert.
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Societies and Academies. Nature 42, 311–312 (1890). https://doi.org/10.1038/042311b0
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DOI: https://doi.org/10.1038/042311b0