Abstract
PARIS.
Academy of Sciences, July 9.M. Ed. Perrier in the chair.L. Maquenne and E. Demoussy The influence of mineral matter on the germination of peas. Peas have been germinated in sand moistened with distilled water containing varying known amounts of metallic salts and the length of the roots measured after six days germination. Twelve metals were used in these experiments, details being given of the results obtained with each one. Calcium would appear to be the only element which, in the absence of any other, is capable of producing normal germination, and the amounts required are extraordinarily small. The growth of the stem will be the object of further researches.E. Aries: The sign of the specific heat of saturated vapour in the neighbourhood of the critical state.A. Thybaut: Tautochrone curves.G. L. le Cocq: All known systems of hyperstatic suspension bridges are derivatives of isostatic suspension bridges, and the latter are only particular cases of one single and unique system which includes all.M. Siegbahn: High-frequency spectra. Some of. the work recently published by MM. R. Ledoux-Lebard and A. Dauvillier has been anticipated by the author and E. Friman (Phil. Mag., July, i9i6).P. Chevenarci: The mechanism of the tempering of carbon steels. The results of the experiments described completely confirm the con- clusions recently published by MM. Portevin and Garvin.A. Portevin: The manganese steels. The steels were submitted to very slow cooling, seventy-five hours in cooling from 1300 to ioo C. The results, given in detl, differ considerably from the effect of a normal annealing (three to five hours from iooo C.). E. Urbain: A method of determining molecular weights. The method is based on determinations of the boiling point of a mixture of the liquid the mole- cular weight of which is to be measured with a non- miscible liquid, such as water, and the composition of the distillate. Examples are given of the measure- ment of the molecular weights by this nethod of benzene, carbon tetrachloride, and limonene.Mlle. Y. Dehorne: The presence of the genus Stromatoporella in the Senonian in the neighbourhood of Mar- tigues (Bouches-du-Rh´ne).----L. Bordas: The egg deposition of Rhynchites oonicus and the anatomy of its larva. This parasite has caused great damage to apple, pear, cherry, and peach trees in Rennes and its neighbourhood.A. Compton: Cerebrospinal meningitis and theteorology
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Societies and Academies . Nature 99, 479–480 (1917). https://doi.org/10.1038/099479a0
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DOI: https://doi.org/10.1038/099479a0