Abstract
PARIS. Academy of Sciences, Nov. 25. L. Mangin: Notice of Sir Ray Lankester, foreign associate of the Academy. Gabriel Bertrand and L. Silberstein: The estimation of sulphur and phosphorus in plants. It was proved that the proportion of sulphur remaining in the ash is always less than that which exists in the plant, the losses ranging from 44 per cent to 76 per cent. There is also a loss of phosphorus during calcination to ash, but the losses are much less, from 0.2 per cent to 7 per cent of the amount present. J.A.LeBel: The sparks which are emitted by stalactites when violently struck with a steel tool. It was at first supposed that these sparks were due to the presence of quartz particles in the rock, but it was later proved that no hard particles were present. The phenomenon is probably due to triboluminescence. G. Friedel and V. Maikowsky: Temperature measurements in borings. The thermometer consists of an ungraduated bulb with capillary tube, with the upper end open and ground to a plane face making an angle of 45° with the tube. The actual temperature at which the tube is exactly full, corresponding to the temperature attained in the boring, is easily determined in the laboratory. Ernest Esclangon was elected a member of the Section of Astronomy in the place of the late P. Puiseux. Herbert Ory: The extraction of roots. H. Millbux: Some properties of meromorph and holomorph functions. Joseph Pors: Some results concerning the stability or the regularity of the movement of a viscous liquid. G. P. Arcay: Contribution to the experimental study of the deformation of the flat spiral. From the experimental evidence given in the paper, it is concluded that the static deformation and the kinematic deformation of the flat spiral, corresponding to the same position of the balance wheel, are in all cases identical. Consequently, it is legitimate to utilise the method of static deformations as a method of experimental control. Louis Hirschauer and Augustin Talon: The autorailroad proposition for rapid transport with high duty. G. Bruhat and R. Legris: The rotatory dispersion of tartaric acid and of the alkaline tartrates in aqueous solution. Jean Thibaud and Jean J. Trillat: The effects of filtration of the general radiation on the X-ray diagrams of liquids. The determination of absorption coefficients. The existence of a secondary diffraction ring due to the general radiation, shows the necessity, in researches on the molecular structure of substances radiographed in thicknesses of several millimetres, of precautions against the formation of the secondary ring. For this, either the radiation may be made monochromatic by reflection from a crystal, or an absorbing sector of aluminium may be placed near the film. M. Bourguel and Mlle. V. Gredy: The mechanism of catalytic hydrogenation. Whatever may be the mode of working, the initial velocity of hydrogenation is, for a given substance, independent of the weight of material to be hydrogenated. The activity of the catalyst is a diminishing function of the initial concentration. The results can be best explained by the assumption of an initial action of the hydrogen on the metal (palladium). L. Meunier and K. Le Viet: The hydrophil properties of collagen. Any substance capable of lowering irreversibly the capacity of the collagen for swelling is a tanning substance, and its astringency is measured by the intensity of this lowering. Jacques Bardet and Arakel Tchakirian: Some combinations of germanium oxide and oxalic acid. Experimental evidence is given for the existence of a complex germano-oxalic acid: it was not possible to isolate a definite compound, but H2Ge(C2O4)3 is probably present in the solution. Mme. Ramart-Lucas and F. Salmon-Legagneur: Stability in absorption spectra. The absorption in the ultra-violet of the dibasic acids of the fatty series. P. Mondain-Monval and R. Quanquin: The temperature of spontaneous inflammation of gaseous mixtures of air and saturated hydrocarbons. The influence of the pressure and of preliminary heating. Supplementing earlier work in which the oxidation was carried out under high pressures, experiments at the ordinary pressure are described. With pentane, aldehydes were detected at 200° C, and were produced in quantity at 325° C. The presence of formaldehyde, acetaldehyde, butyraldehyde, and fatty acids was proved. G. Dupont and J. Levy: The autoxidation of abietic acid. The action of catalysts. In a previous communication the autoxidation of abietic acid was shown to be a typical example of autocatalysis. The influence of the addition of catalysts has now been studied: cobalt abietate proved to be the most active positive catalyst. Lucien Dupont: The action of caustic alkalis at high temperatures on albumenoids. The proportions of oxalic, benzoic, and various fatty acids obtained by potash fusion at 325° C. are given for gelatine and for egg albumen. J. Grard: Some reactions of propargyl acetal. A. Guyot and M. Fournier: A new general method for the preparation of primary and secondary amines. The reaction proposed is R · CH2OH + R′NH2 = R·CH2·NHR′ + H2O. This takes place in an autoclave in the presence of reduced nickel at temperatures from 150° to 190° C. If ammonia is used in place of the primary amine, both primary and secondary amine are formed in proportions depending on the temperature. The yields are high and the method appears to be general. D. Ivanoff: Some properties of the true mixed organo-magnesium carbonates. L. Royer: New observations on the asymmetry of the corrosion figures obtained by an active isotropic liquid. E. Raguin: Subdivisions of the layer of bright schists in Haute-Maurienne. Yang Kieh: The massif of crushed pegmatite situated at the southern edge of the geological sheet of Aigurande (scale 1/80,000). Marcel Thoral: Palontological discoveries in the Cambrian and Silurian of the mountains of Lacaune to the north of the Montagne Noire. J. Thoulet: Isothermal oceanic liquid cones of whirling. R. Combes and M. Piney: Proteolysis and proteogenesis in ligneous plants during the summer and autumn. A. Orekhoff: The alkaloids of Anabasis aphylla. This plant, which grows wild in Turkestan and Transcaucasia, is known to be very poisonous. A new base, anabasine, C10H16N2, has been extracted from the dry plant and prepared pure. Other bases, not so far obtained pure enough for analysis, are also present. G. Nicolas and Mile. Aggery: A new example of generalised bacterial infection in plants. J. Andre Thomas: The phenomena of modification of toxic attack of the Convoluta as a function of their grouping. Jean Saidman: Radiotherapy of serophagy.
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Societies and Academies. Nature 125, 73–75 (1930). https://doi.org/10.1038/125073b0
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DOI: https://doi.org/10.1038/125073b0