Abstract
PARIS. Academy of Sciences, August 17.—M. Ed. Perrier in the chair.—Paul Appell: Contribution to the study of the 0 functions of higher degrees.—W. Kilian and Antonin Lanquine: The coexistence, in the neighbourhood of Castellane, of pyreneo-provengal dislocations and of Alpine folds, and on the complexity of these orogenic phenomena.—Joseph Peres: Bessel's functions with several variables.—H. G. Block: The equation of elastic rods.—Jose. Rodriguez Mourelo: The phototropy of inorganic systems. The case of calcium sulphide. These sulphides were made by heating precipitated chalk (100 gr.), common salt (0.1 gr.), sodium carbonate (0.03 gr.), sulphur, and certain phosphorogens, such as manganese and bismuth salts. The colour develops in a strong light, not sunlight, in two or three minutes. In one set of experiments the proportion of manganese added varied between o.i per cent, and 0.0001 per cent. The observed colours passed through reddish-violet, pink, to an intense violet, the maximum phototropic effect being obtained with 0.005 per cent, of manganese. The colours were increased in intensity by the addition of both manganese and bismuth.—M. Pontio: A method of control for rapidly estimating the quantity of nickel deposited in nickel plating. The method is based on the use of a solution of dilute hydrochloric acid and hydrogen peroxide, which attacks the underlying metal (copper, iron) more rapidly than the deposited nickel.—Alberto Betim: A layer of euxenite in Brazil. This deposit was found near Pomba (Minas-Geraes), Brazil. A spectrographic analysis of the mineral showed the presence of titanium, niobium, yttrium, ytterbium, erbium. Chemical analysis provedf uranium (4 to 11 per cent, of the oxide), thorium, traces of cerium, tin, arsenic, lead, gallium, and gold.—Ed. Detefme: A new mode of grafting the flexor tendons of the fingers. In cases of severe wounds of the palms of the hands, with loss of one or more of the flexor tendons, an operation has been devised, full details of which are given, in.which portions of the flexor tendon of the fore-arm are grafted over on to the hand.-E. Hayser: Contribution to the study of the ferments of rum. It is shown that the use of the microscope can render great services in rum manufacture: it can prove contamination, and direct the fermentation to obtain products of constant composition.—Em. Bourquelot and A. Aubry: The influence of soda on the synthetic and hydrolytic properties of a-glucosidase (glucosidase from low yeast, air dried). A set of ten experiments, in which the proportion of caustic soda was gradually increased, gave results showing that the synthetic reaction was not sensibly affected so long as the mixture remained acid. In a neutral mixture the reaction does not attain its normal equilibrium, and with distinct alkaline reaction the synthetic reaction stops, although no secondary isomerising reactions have been set up by the alkali.
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Societies and Academies . Nature 95, 721–722 (1915). https://doi.org/10.1038/095721b0
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DOI: https://doi.org/10.1038/095721b0