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Nature volume 128, pages 386387 (29 August 1931) | Download Citation



PARIS. Academy of Sciences, June 29.—The president announced the death of Friedrich Becke, Correspondant for the Section of Mineralogy.—A. Lacroix: New observations on the tectites of Indo-China. Discussion of their origin. From the examination of a large number of fresh specimens it is concluded that the tectites result from the vertical fall of fused material possessing a high temperature. This agrees with the hypothesis of a meteoric origin of the tectites.—Emm. de Margerie: The last sheets of the Carte Générate Bathymétrique dee Océans (Panneau du Pôle Nord).—Paul Montel: Functions of several linearly dependent variables.—E. Kogbetliantz: New observations on the orthogonal system of Hermite polynomials.—Lucien Féraud: Completely stable systems in the neighbourhood of an equilibrium point.—H. Guillemet: The evolution of the wake behind an obstacle for small values of Reynoldss number.—Mme. V. Popovitch-Schneider: The extension of Hele-Shaw's method to cyclic movements. The results of the experiments, in spite of the wall effect due to the small dimensions of the apparatus, show good agreement with theory. Four reproductions of photographs accompany the paper.—Emile Bélot: The double origin of the small planets and their emission by the rings and vortices of the large planets.—Louis Gérard: Reflection on a moving mirror and relativity.—A. Damiens and L. Domange: An electric furnace made of fluorspar. Details of construction of an electric tube furnace in which the inner tube is made of fluorspar. It permits of working with fluorine or hydrofluoric acid at a temperature of 1000° C.—B. Decoux: A piezoelectric quartz frequency meter with synchronous modulation. The meter described is transportable and is capable of high accuracy. It can also be used as a stable receiver by using the apparatus as a heterodyne.—P. Fleury: A precision luxmeter with homochrome regions.—Léon and Eugène Bloch, F. Esclangon, and P. Lacroute: The observation of the Zeeman effect with high frequency. High frequency discharges in rarefied gases, already proved to be of great service for the production and separation of higher order spectra, can also be utilised with advantage for the study of the Zeeman effect. The results of experiments with neon and with mercury (field 26,260 gauss) are given.—D. Malan: The absorption spectrum of oxygen at high temperatures. This work was undertaken with the view of detecting the formation of ozone in oxygen at a high temperature. At 1400° C. no ozone could be detected by the absorption method, and it is concluded that unless the absorption of ozone is diminished at the high temperature, the quantity of ozone produced, if any, must be very small.—P. Daure and A. Kastler: The Raman effect in some gases. The gases studied were hydrogen, acetylene, cyanogen, and steam.—Francois Reymond and Tcheng da tchang. The separation of polonium and of protactinium fixed on tantalum oxide. To the tantalic acid gel in solution in hydrofluoric acid some selenious acid is added, followed by sulphuric acid and sodium bisulphite. The reduced selenium produced by boiling carries down with it the whole of the polonium present.—F. Bourion and E. Rouyer; The cryoscopic study of paraldehyde in solutions of lithium chloride and magnesium chloride.—Francis Perrin: Molecular association and the optimum for fluorescence of solutions. The influence of salts.—Maurice Curie and M. Prost: The radiation accompanying the hydration of quinine sulphate. In water vapour at the pressure of 1 mm. the path of the radiation is about 1 mm.; at atmospheric pressure the path would be of the order of 0001 mm.—Mile. Sabine Filitti: The determination of the charge of the micelle. It is possible to determine the granular charge of a non-ionised colloid of known micellary weight by measuring the fall of pH. produced in the dispersing medium by a given mass of dissolved substance.—P. Mougnaud: The estimation of fluorine. A detailed examination of the methods of Rose and of Carrière and Rouanet. The latter is rejected as inaccurate; the former is capable of improvement. Mile. M. L. Delwaulle: The action of hydrogen upon potassium permanganate.—P. Carreé and P. Mauclère: The chloride of acid ethyl sulphite and the neutral mixed alkyl sulphites. The observation of Michaelis and Wagner on the production of (C2H5O) SO.Cl by the interaction of neutral ethyl sulphite and phosphorus pentachloride, with subsequent separation by distillation, is shown to be inaccurate, This compound is formed by treating thionyl chloride with alcohol in the presence of pyridine, but commences to decompose at 18° C. and cannot be distilled.—Paul Jodot: The diffusion of silica during the formation of Corsican jaspers.—Conrad Kilian: The age of the Harlania grits, and the extension of the Silurian in the eastern Sahara.—Couvreur: Comparison of the testa of lamellibranehs and gastropods.—Louis Dangeard: The presence of coccolith and coccosphere beds in the laguno-lacustral Oligocene of Limagne.—H. Colin and P. Billon: Potash in the sugar beet.—Émile Saillard: Sugar beets and molasses (nitrogen and raffinose).—L. Bordas: The comparative anatomy of the ovaries of some Hymenoptera.—Charles Pérez: The successive replacement of the viseeral sacs in Chlorogaster.—Jules Amar: Vital capacity and pulmonary ventilation.—Léon Binet and M. V. Strumza: The hæmatopoietic power of carotene. In anæmic dogs the administration of carotene by the digestive tract has a marked influence in increasing the proportion of hæmoglobin.—Jean Saidman, Jean Meyer, and Roger Cahen: The local effects in the rat due to electric fields of very high frequency. Regional irradiation causes a relatively slight rise in the general temperature, but causes a sharp rise in the temperature of the irradiated region. Abdominal irradiation produces death when the temperature reaches 43.5° C.—Boris Ephrussi: The factors limiting the increase of cultures of tissues in vitro. Meaning of the residual energy.—Delherm and Laquerrière: A new electrotherapeutic apparatus for the production of long period alternating waves and undulatory currents.—C. Levaditi, A. Vaisman, Miles. R. Schoen and Y. Manin: The calcifying action of bismuth.

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