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PARIS. Academy of Sciences, Mar. 3.—Emile Borel: Probabilities universally negligible.L. Lecornu: The loss of heat in explosion motors.—A. Cotton and G. Dupouy: The magnetic fields given by the large Bellevue electro-magnet. Diagrams are given of the results of the exploration of the magnetic fields produced under varying conditions of radius of the pole pieces, and distance between them. For very small pole pieces and at a distance apart of 2 mm., the field is near 70,000 gauss.—Charles Moureu, Charles Dufraisse, and Nicolas Drisch: Researches on the mechanism of the formation of rubrene: a new synthesis. The starting point of this synthesis is the ketone (C46H5)2C=CH-CO-C6H5. Treatment with phosphorus pentachloride and the resulting chlorine derivative allowed to react with potassium acetate gives a substance capable of conversion into rubrene by simple heating. The yield is 30 per cent of the original ketone, and the new synthesis has nothing in common with the older methods of preparation.—J. Costantin: Mountain plants and Lamarckism. A discussion of the resistance to disease in the sugar cane acquired by growth at high altitudes and its transmission.—E. L. Bouvier: Some observations on the Saturnioid butterflies of the family of the Cerato-campidse.—V. Grignard and Th. N. Iliesco: The condensation of isobutanal. A resume of work published in detail elsewhere.—Raffaele Nasini was elected a Correspondent for the Section of Chemistry. Bertrand Gambler: Some properties of circles.—A. Buhl: The cartography, in Ez, of triple integrals with fields deformed in E.A. Marchaud: A characteristic topological property of Jordan curves without a double point.—Georges Durand: Ordinary points and singular points of envelopes of spheres.—Henri Poncin: A mixed problem in a circular ring.—Julius Wolff: The angular derivative in conformal representation.—J. Haag: The theory of the rachet pins.—A. Gruvel and W. Besnard: Description and presentation of a new oceanographic apparatus. The instrument is designed to collect a specimen of water, to measure the temperature at a predetermined depth, and to measure the depth at which these operations are carried out. Georges Dejardin: The second spectrum of xenon in the interval 9000 A.—6000 A. The lines given were obtained by using the oscillating discharge in a tube without electrodes.—V. Ambarzumian and D. Iwan-enko: Unobservable electrons and the 3-rays. An outline of a theory of 3-rays analogous with the theory of light quanta proposed by Dirac.—Estanave: A new contribution to integral photography.—F. Bourion and E. Rouyer: The cryoscopic study of paraldehyde in aqueous solution, and in solutions of potassium chloride.—Alfred Molnar: Researches on the cold hardening of lead, tin, and cadmium at different temperatures.—Marcel Guillot: The carrying down of polonium, a chloropoloniate, by ammonium chloroplumbate. The precipitation of crystals of (NH4)2PbCl6 from a solution containing polonium results in partition of the polonium between the liquid and crystal phases. Since, under the same conditions of acidity, the precipitation of lead chloride from a solution containing polonium leaves the whole of the latter in solution, it is concluded that the phenomenon is probably not due to adsorption but to the formation of a polonium compound (NH4)2PoCl6, isomorphous with the lead chloroplumbate.—C. Matveyeff: The cone-in-cone structure observed in the celestine of Wereino (Ural). Philippe Fabre: The laws of electrical excitability by very short discharges in rapid muscles.—C. Ninni: The demonstration of the existence of the tubercle ultra-virus by direct inoculation in the lymphatic ganglions.
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Societies and Academies. Nature 125, 586–587 (1930). https://doi.org/10.1038/125586a0
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DOI: https://doi.org/10.1038/125586a0