Abstract
PARIS. Academy of Sciences, August 23.—M. Henri Deslandres in the chair.—A. Lacroix: The existence in Madagascar of a silicate of scandium and yttrium, thort-veitite. This mineral, the richest known in scandium, was discovered in 1911 by J. Schetelig in Norway, and since that time has not been found in any other locality. Amongst specimens collected from the pegmatite of Befanamo, Madagascar, was one which agreed in its physical properties with the mineral described by Schetelig. The presence of scandium, ytterbium, and neoytterbium was confirmed by the spectrograph, and there were also indications of zirconium, aluminium, and titanium. In view of the importance of obtaining a sufficient supply of scandium for a more complete study of this element, other minerals from this region have been examined spectro-scopically, and scandium has been detected in cyrho- phane, a mineral not hitherto reported as containing this metal.—E. Bourquelot: Remarks on the biochemical method of examining hydrolysable glucosides by emulsin, with reference to the note by M. P. Delauney. Historical account of the results obtained since 1901 by the application of this method. Glucosides have been discovered and isolated in fifty-six species of plants.—E. Cosserat: Stars the annual proper motion of which exceeds 0.5″. An addition of two stars to the list published on September 1 in the Comptes rendus.—I. Fredholm: The reduction of a problem of rational mechanics to a linear integral equation.—P. Humbert: The function
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Societies and Academies. Nature 106, 134–136 (1920). https://doi.org/10.1038/106134b0
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DOI: https://doi.org/10.1038/106134b0