Abstract
PARIS. Academy of Sciences, July 21.—M. Léon Guignard in the chair.—J. Boussinesq: The existence of an approximate relation, pointed out by M. Carvallo for quartz, between the two rotatory and dispersive powers of bodies.—A. Gautier and P. Clausmann: The action of fluorides upon vegetation. Field culture experiments. The fluorine in these experiments was added in the form of amorphous calcium fluoride; it was found to be favourable to the growth of wheat, oats, carrot, broad bean, cabbage, pea, poppy, potato, and hemp. No effect was observed with barley, rye, bean, buckwheat, and mustard, whilst beetroot, turnip, and onion were prejudicially affected by fluorides.-P. Saba-tier and A. Mailhe: The catalytic formation of alkyl chlorides, starting with the primary alcohols. A mixture of hydrochloric acid and alcohol vapour, passed over alumina heated to 370° to 450° C., gives the alkyl chloride mixed with the ethylenic hydrocarbon produced by the dehydration of the alcohol. Primary, secondary, and tertiary chlorides may be formed in this reaction. V. Grignard and G. Rival: The addition compounds of halogen acids to diphenylarsenic acid. The addition products [(CeH^.AsO.OHLHCl and (C6H5)2.AsO.OH.HCl. and two corresponding compounds with HBr were isolated and analysed.-G. Giraud: The classification of substitutions of certain automorph groups of n variables, and the algebraic relations which exist between any (n+i) functions corresponding with certain of these groups.-M. de BrogHe: The X-ray spectra of the elements. Measurements of the K spectrum of rhodium and L absorption spectrum of radium.-J. Hebert-Stevens and A. Larigaldie: Radio-telegraphy by infra-red radiation. The light from an arc projector is filtered through a screen which absorbs all the visible rays but allows a portion of the infrared rays to pass. The receiver is a parabolic mirror with a sensitive thermo-couple placed at its focus, and| the latter actuates a relay. Messages have been sent over 20 kilometres with this apparatus.-S. Posternak: The synthesis of the hexaphosphate of inqsite and its identity with the phospho-organic reserve principle of green plants. The ester was prepared from inosite and phosphoric acid in presence of an excess of phosphorus, pentoxide. The yield is low, 3 to 5 per cent., and the substance is identical in all respects with the natural product from phytine.-R. Levailiant and L. J. Simon: The action of chlorosulphonic acid on methyl hydrogen sulphate. Methyl chlorosulphonate, C1.SO2.(O.CH3), can be isolated from the products of this reaction.-P. Thiery: The geology of the region of Alais (Gard).-L. Gentil: The genesis of the forms of strata in chalk districts called rideaux.— S. Stefanescu: The teeth of elephants and mastodons.
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Societies and Academies . Nature 103, 479–480 (1919). https://doi.org/10.1038/103479b0
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DOI: https://doi.org/10.1038/103479b0