Abstract
PARIS. Academy of Sciences, July 28.—M. F. Guyon in the chair.—Maurice Hamy: Study of the nitrogen radiations. The explanation of the width of the lines of the spectrum of rarefied gases, based on the Doppler-Fizeau principle, has been recently verified experimentally by Buisson and Fabry working with Gejssler tubes containing the rare gases of the atmosphere. Similar work on nitrogen, a gas furnishing a band spectrum, is now described by the author, and he concludes that the band spectrum of nitrogen obeys the same laws as line spectra, as regards the difference of path required to make interference bands disappear.—E. Jnngfleisch and L. Brunei: The sulphur set at liberty in the action between sulphurous acid and water. A study of the condition in which the sulphur is deposited in this reaction. Five photographs accompany the paper.—Lucas Championniere: Operation for club foot by ablation of all the bones of the tarsus. Osseous regeneration in young subjects. The operation consists in the removal of all the tarsal bones with the exception of the posterior portion of the calcaneum. A description of the results in forty-two cases is given. In young children there is distinct regeneration of a portion of the bone removed.—Couyat Barthoux and H. Douvill´: The Jurassic in the desert to the east of the Isthmus of Suez.—P. Duhem: The formula for the velocity of sound. A correction of a formula recently published by M. Ariès.—J. Guillaume: Observations of the sun made at the Observatory of Lyons during the second quarter of 1913. Observations were possible on seventy-seven days, and the results are grouped in three tables showing the number of spots, their distribution in latitude, and the distribution of the faculae in latitude.-Rodolphe Soreau: An approximate formula for the arc of an ellipse.—E. Stiemke: Numbered moduli.—Kr. Birkeland: The conservation and the origin of terrestrial magnetism.—Georges Claude: The maintenance without difficulty of a temperature of –211° C. by the use of liquid nitrogen. A rapid stream of hydrogen, 20 to 25 litres per minute, previously cooled by flowing through a copper spiral immersed in liquid nitrogen, is passed through about 0·75 litre of liquid nitrogen contained in a capacious Dewar vessel.. The temperature rapidly falls, and after about twenty minutes remains steady at –211° C., the melting point of nitrogen. At this point about two-thirds of the original liquid remains in the tube.—R. Ladenburg and F. Reiche: The absorption of coloured flames. It was shown more than thirty years ago by M. Gouy that the absorption of a coloured flame for the narrow lines of the spectrum which it emits is far from being complete, and that it was possible to calculate from his measurements the brightness of the lines as a function of the product of the thickness of the layer by the density of the metallic vapour. In the present paper these experimental results are compared with relations furnished by the electronic theory of dispersion. The two are shown to be in good agreement. If, on the other hand, the intensity of the lines is governed, not by the theory of dispersion, but by Rayleigh's theory according to the Doppler effect, then there is no agreement between the theory and Gouy's experiments.—E. Briner: The dissociation of the molecules into atoms considered as one of the factors of reaction velocity.—Victor Henri and René Wurmser: The negative photocatalysis of hydrogen peroxide. The stimulating or poisoning effect produced by certain substances on ferment actions has been hitherto ascribed to the action of the stimulant or poison on the ferment; the authors hold that this view must be modified in so far as this action may take place not on the ferment but on the body under transformation. In support of this view they adduce experiments on the photocatalysis of solutions of hydrogen peroxide in presence of traces of various substances, including sulphuric acid, caustic soda, iodine, potassium cyanide, &c. The addition of traces of these substances caused an increase of stability of the hydrogen peroxide towards ultraviolet rays.—F. Bourion and A. Deshayes: The quantitative separation of chromium and aluminium. The analysis of chromite. The method proposed is based on the use of a mixture of chlorine and sulphur chloride.—C. J. Pitard: Statistics and affinities of the flora of Chaouïa.—O. Mengel: The evolution of mildew according to the conditions of the medium.—Ch. Julin and A. Robert: Ascidia fumigata. Contribution to the study of the classification of the Phallusiideæ.—M. Ruot: Bacillus lactis fermentens, a spore forming butyleneglycol ferment of milk sugar. This organism produces an active fermentation of milk, 2:3-butylene-glycol accumulating in the culture, other products being carbon dioxide, hydrogen, acetylmethylcarbinol, acetic and formic acids.—Maurice Renaud: The irradiation of bacteria and the irradiated vaccines. For all the organisms studied irradiation with a quartz mercury-vapour lamp rendered the media sterile, leaving intact the histochemical properties. Irradiation prolonged beyond the period necessary for sterilisation does not diminish the activity of the soluble products of bacterial origin, such as tpxins. The therapeutic application of irradiated cultures is discussed.—F. X. Lesbre and R. Pécherot: A calf born without the upper jawbone; a new Cyclocephalian type.—Eric Gerard and Hermann Chauvin: The waters of Spa. Radioactivity, electrical resistance, and crvoscopy.—J. Ventre: The. influence of the yeasts on the variations of dry extract and of glycerol in wines.—L. Lindet: The soluble albuminoid matters of milk.—Ch. Dhéré: The diversity of haemocyanines according to their zoological origin.
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Societies and Academies . Nature 91, 601–602 (1913). https://doi.org/10.1038/091601a0
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DOI: https://doi.org/10.1038/091601a0