Abstract
PABIS. Academy of Sciences, Aug. 13.—A. Lacroix: New observations on the lavas of the Marquesas and the island of Tubuai (Southern Polynesia). Complete analyses of 21 specimens are given.—Eugéne Slutsky: A criterion of the stochastic convergence of ensembles of contingent values.—Silvio Minetti: An equality in the theory of integral functions.—Henri Muraour: The laws of combustion of colloidal powders.—G. Valensi: The action of nitrogen on manganese. Pyrophoric manganese, obtained by the distillation of its amalgam, heated in nitrogen under atmospheric pressure, absorbs quantities of the gas which are a function of the temperature. The experimental results are given as curves. The true composition of the manganese nitride is still unknown, but is certainly richer in nitrogen than the generally accepted Mn3N2.—Eugene: Annealing anomalies after cold hardening of copper and brasses.—A. Travers and Sehnoutka: The hydrated tricalcmm aluminate. The existence of this compound has been doubted: by using very dilute solutions of potassium aluminate and calcium nitrate, fine needles are obtained which have the composition A12O3.3CaO.21H2O. The pH of the solution must be maintained within close limits, 11.55 and 11.62.—Bourguel and Rambaud: The determination of the spatial configuration of two cis-trans-ethylenic isomers. A study of the isomeric tetra-methylbutenediols, (CH3)2C(OH).CH=CH.C(OH)(CH3)2.
Article PDF
Rights and permissions
About this article
Cite this article
Societies and Academies. Nature 122, 498–499 (1928). https://doi.org/10.1038/122498a0
Issue Date:
DOI: https://doi.org/10.1038/122498a0