Details

Titel

Societies and Academies

Ist Teil von

• Nature (London), 1922-08, Vol.110 (2756), p.299-300

Erscheinungsjahr

1922

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Paris. Academy of Sciences, July 24.-M. Haller Li the chair.-Charles Moureu: The third international conference of pure and applied chemistry. This conference was held at Lyons from June 27 to July 1, and was attended by representatives from 24 nations. The next meeting will be held at Cambridge in June 1923.-Maurice Leblanc: The electrification of railways by means of high frequency alternating currents. -V. Grignard and A. C. Purdy: α-β′-dichlorethyl ether. Three of the four possible dichlorethers are known. The fourth, CH3. CHC1. O.CH2. CH2C1, has now been prepared by the action of dry hydrochloric acid upon a mixture of paraldehyde and ethylene monochlorhydrin. - M. Abramesco: The series of polynomials with two complex variables.- Farid Boulad Bey: The geometrical examination of the internal forces and displacements round a point in an elastic body.-Paul Dienes: The displacement of tensors.-Paul Sacerdote and Pierre Lambert: A new method for detecting the presence of a submarine. The plan proposed is suitable for a narrow entrance to a port and is based on the difference between the electric conductivity of the submarine and of sea water.-G. Athanasiu: An actinometer with electrodes of mercury covered with a thin layer of mercurous chloride, bromide, fluoride, or sulphide. A cell is constructed of H form, with mercury electrodes covered with a thin film of haloid salt. Exposure of one electrode to light causes an immediate increase in the E.M.F. of the cell.-St. Procopiu: The variations in the arc spectrum of mercury with the conditions of emission. In a vacuum, working at 14 to 15 volts, with low vapour pressure, there are more lines visible in the ultra-violet (up to 2191) than when working with 65 volts and 3-5 amperes. Other modifications are noted if the arc is working in air or in coal gas, the lines forming the triplets in the two secondary series being specially affected.-Mlle. Irène Curie: The determination of the velocity of a rays of polonium. The method of deviation in a magnetic field was employed; and this gave 1-593 x io9 cm. per second for the velocity of the a rays of polonium, with a precision of about 0-3 per cent. Geiger, by a different method, obtained a result within 0-4 per cent, of the above.-P. Lebeau and M. Picon: The reactions furnished by sodammonium with hydrocarbons. Paraffins and ethylene derivatives are unacted upon by sodammonium: allylene gives 66 per cent, of the sodium derivative and 33 per cent, of propylene, and other hydrocarbons of the acetylene series behave similarly. Benzene and its derivatives are unacted upon, as are also the terpenes. Naphthalene, acenaphthene, and phenathrene give tetra-hydrides.-Octave Mengel: The fall of dust called a "rain of blood."Remarks on the coloured snow which fell in Briancon on March 12, 1922. The meteorological data suggest that this dust came from the Sahara.-Emile F. Terroine and Rene Wurmser: The utilisation of ternary substances in the growth of Aspergillus niger. This mould would appear to utilise indifferently any sugar in its growth, and shows no qualitative preference. The sugars used were glucose, levulose, saccharose, maltose, arabinose, and xylose. The concentration of the nitrogenous food (ammonium sulphate) was also without effect on the growth, but the nature of the source of nitrogen had a marked influence.-L. Blaringhem: The heredity of the physiological characters in the hybrids of barley (second generation).-Paul Becquerel: The theory of the meriphyte in the phenomena of vascular ontogeny. -A. Pezard: The idea of the "seuil differentiel"and progressive masculinisation of certain female birds. The experimental results relating to the action of the ovary on the plumage of birds can explain, on the hormone theory alone, some anomalies apparently in disagreement with recent theories of endocrinology.-¦ Paul Wintrebert: The mode of building of the vomer in the course of metamorphosis in the Salamandridae. -Paul Carnot and Marc Tiffeneau: A new hypnotic in the barbituric series: butyl-ethyl-malonylurea. The hypnotic properties of the dialkyl-malonylureas were studied by E. Fischer from dimethyl to the di-isoamyl derivative; but the unsymmetrically substituted malonylureas were not examined. This has been taken up by the authors, who find in ethyl-butyl-malonylurea a useful new hypnotic. It has three times the hypnotic power of veronal and has given satisfactory results in clinical practice.