Abstract
PARIS. Academy of Sciences, July 30.—M. Guillaume Bigourdan in the chair.—Gabriel Bertrand and B. Benzon. A kind of physiological mutation observed in mice. During the study of the effects of the addition of a trace of zinc to the food of mice in the absence of vitamins, one mouse survived eleven weeks before showing any symptom of trouble, while all the other animals lived only from three to five weeks.—V. Grignard and M. Dubien: The condensing action of the mixed magnesium alcoholates, ROMgX. The alcoholates of the type C2H5 . O Mgl produce energetic condensation of aldehydes and ketones, aldols being formed.—Jean Chazy. The field of gravitation of two fixed masses in the theory of relativity.—Th. Varopoulos: The number of exceptional values of multiform functions.—Ch. Maurain, A. Toussaint, and R. Pris: The measurement of air resistance on railway material. An account of the results of experiments carried out on a model train, one-twentieth real size.—Albert Portevin and Fran9ois Le Chatelier: Obtaining, by heat treatment, light aluminium alloys of high tensile strength not containing magnesium. The effect of the temperature of tempering is given for an aluminium alloy (4.3 per cent. copper, 0.8 per cent. manganese, 0.38 per cent. silicon) and the results contrasted with alloys of the duralumin type containing magnesium.—Andre Job and Guy Emschwilier: The photochemical reduction of zinc sulphide. Phosphorescent zinc sulphide suspended in air-free water and submitted to ultraviolet radiation from a mercury lamp gives metallic zinc and free sulphur, some centigrams of zinc per hour being formed.—MM. Wertenstein and Jedrzejewski: The evaporation of carbon. The rate of evaporation (m) of carbon filament has been determined at temperatures between 2800° and 3500° C. absolute, and the results are in accord with the equation
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Societies and Academies. Nature 112, 347–348 (1923). https://doi.org/10.1038/112347a0
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DOI: https://doi.org/10.1038/112347a0