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PARIS.
Academy of Sciences, October 26.—M. Duchartre in the chair.—On the theory of Hertz-oscillations, by M. H. Poincare. —On a new mineral-boleite. by MM. Mallard andE. Cumenge. The new mineral occurs with copper in. volcanic tuff and conglomerate found near Santa Rosalia, Lower California. It crystallizes in the cubic system, and its composition is represented by the expression PbCl2 + CuO.H?O + s^gCl. Its density is a little greater than that of calcite; cleavage easy parallel to the faces of cube, much less easy parallel to faces of octahedrons. Approximate index of refraction, 2-07.—Vasomotor action of bacteria, by M. Ch. Bouchard,—Contribution to the botanical history of the truffle (fourth note): Kama of Bagdad (Terfezia Hafizi and Terfezia metaxasi) and of Smyrna (Terfezia Lconis), by M. Ad. Chatin.—On a storm observed at* the Canary Islands. This is an extract from a memoir by M. de la Monneraye.—On the original causes of cyclones, and on their precursory signs: extract from a memoir by M. Le Goarant de Tromelin.-On the theory of the voltaic pile, by M. P. Duhem.—Experimental researches on a category of capillary phenomena, with an application to the analysis of alcoholic liquids and others, by M. Emile Gossart.—On bromo-stannates, by M. Leteur. The author has prepared the following bromostannates, the general method consisting in mixing concentrated solutions of the two bromides, and evaporating the mixture in a vacuu n or dry air: SnBr4NH4Br, SnBr4NaBr + 6H2O, MgBr2 . SnBr4 + IoH2O.—On a new crystalline ferric oxychloride, by M. G. Rousseau. Concentrated solutions containing more than 80 per cent, of Fe2Cl6, if kept for some time at a temperature between 160° and 220° C., give rise to crystalline ferric oxychloride, 2Fe2O3. Fe2Cl2.3H2O. The author has studied the decomposition of solutions of ferric chloride at temperatures higher than 220°. Between 225° and 280° anhydrous oxychloride (2Fe2O3 Fe2Cl6) was obtained. At temperatures between 300° and 340° a new oxychloride was formed, having the composition 3Fe2O3. Fe2Cl6.—On the estimation of thallium, by M. H. Baubigny.—On the solution of bismuth chloride in saturated solutions of sodium chloride, and on the basic salicylate of bismuth, by M. H. Causse.—On a characteristic difference between the alcoholic radicles substituted in place of carbon and nitrogen, by M. C. Matignon. From a thermo-chemical investigation the author finds that the substitution of an alcoholic radicle for nitrogen increases the heat of combustion more than the substitution of the same radicle for carbon.—Action of ben-zoic acid on essence of turpentine, by MM. G. Bouchardat and J. Lafont.—On the formation of quaternary iodides of ammonium by the action of trimethylamine, in concentrated aqueous solutions, or the hydriodic ethers of several primary and one secondary alcohol, by MM. H. and A. Malbot. —On a new albuminoid substance in the blood serum of man, by M. C. Chabrié.—The soluble substances of the pyocyanic bacillus producing fever, by M. A. Charrin.—Experimental progressive muscular atrophy, by M. Roger.—Some anatomical characteristics of Hyperoodon rostrattis, by M. E. L. Bouvier.— Apropos the chromatophores of Cephalopods, by M. Raphael Blanchard.—Physiology of the nerve which enables us to localize sounds, by M. Pierre Bonnier.-On a method for destroying insects injurious to the beetroot and cereals, by M. Decaux.
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Societies and Academies . Nature 45, 23–24 (1891). https://doi.org/10.1038/045023b0
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DOI: https://doi.org/10.1038/045023b0