Abstract
PARIS. Academy of Sciences, July 18.—M. Émile Picard in the chair.—P. Villard and H. Abraham: The existence of two explosive potentials; a reply to a recent note of M. Amaduzzi. The authors state that their original intention was to bring forward a theory of the silent and continuous discharge, characterised by luminescence at the anode, based in accordance with the modern hypotheses as to the passage of electricity in gases.—L. Maquenne and E. Demoussy: The toxic qualities of certain salts towards green leaves. The salts of ammonium are shown to be specially dangerous in this respect, while calcium chloride and sea salt have very little effect.—A. Laveran and A. Pettit: The forms of endogenous multiplication of Haemogregarina sebai. Observation in this organism shows for a given species a great variety in the multiplication cysts, both in dimensions and number of merozoites, such that it is necessary to beware of assuming the existence of different species too readily.—Joannes Chatin: The variations of structure of the sclerotic among vertebrates.—Ch. Platrier: A problem of rational mechanics and its application to the theory of propulsive helices.—Ernest Esclangron: The passage of the earth through the tail of Halley's comet.—M. Schulhof: Some remarks on the inequalities of the longitude of the moon.—Jules Drach: The logical problem of the integration of differential equations.—Serge Bernstein: The equations of the calculus of variations.—Sigismond Janiszewski: The geometry of cantor lines.—L. Zoretti: The notion of a line.—Jean Chazy: A differential equation of the third order which has its critical points fixed.—René Garnier: A class of differential equations the general integrals of which have their critical points fixed.—Witold Jarkowski: Some theorems on “sustainers.”—A. Tanakadate: A photographic study of the current of air produced by the movement of a helix.—E. Mathias and H. Kamerlingh Onnes: The rectilinear diameter of oxygen. Experiments in the case of oxygen give an affirmative answer to the question whether the deformation of the surface when the critical temperature is lowered leaves intact its rectilinear form.—A. Perot and J. Bosler: The theory of the luminescence of the mercury arc in vacua.—A. Tian: The action of ultra-violet rays on gelatine. These rays destroy jellies, causing their liquefaction or solution, thus forming a contrast to the action of the same rays in coagulating albumen.—G. A. Hemsalech: The relative periods of calcium rays in the spark of self-induction. Experiments of this character provide useful indications in-the analysis of bodies containing unknown impurities.—H. Buisson and Ch. Fabry: The electric arc in an atmosphere of feeble pressure.—M. Rouch: Observations of atmospheric electricity made on Petermann Island during the stay of the Charcot expedition.—William Duane: A photographic method of registering a particles.—M. Garre: Sulphate of thorium. The author finds that sulphate of thorium in aqueous solution shows a specific resistance and a freezing point entirely in agreement with the laws of Bouty and Raoult. Measurements also of conductivity and freezing point of solutions containing 1 per cent, of potassium sulphate show the existence of a double salt.—F. Bodroux: The action of some ether salts of monobasic fatty acids on the mono-sodium derivative of benzyl cyanide.—Marcel Guichard: The absorption of iodine by solid bodies. The fixation of iodine by the surface of a solid is a specific property, and the author gives a list of a number of substances showing this behaviour.—M. Card: Binary hybrids of the first generation in the genus Cistus and Mendelian characters.—B. Sauton: Influence of iron on the formation of the spores of Aspergillus niger.—Pierre Marty: New observations on the fossil flora of the Cantal.—Eugene Collin: A determination of the nature of the wick of a Punic lamp. The author believes the fibres to have been undoubtedly of flax.—Rémy Perrier and Henri Fischer: Some particular points in the anatomy of molluscs of the genus Acera.—MM. Jammes and Martin: The rôle of the chitin in the development of nematode parasites.—Henry Penau: The cytology of Endomyces albicans (P. Vuillemin).—Amédée Delcourt and Emile Cuyénot: The possibility of studying certain Diptera in a definite medium.—Charles Nicolle and E. Conseil: Experimental, reproduction of exanthe-matic typhus by direct inoculation with human virus.—M. Lucet: The presence of Spirochetae in a case of haemorrhagic gastro-enteritis in a dog.
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Societies and Academies . Nature 84, 131–132 (1910). https://doi.org/10.1038/084131a0
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DOI: https://doi.org/10.1038/084131a0
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