Abstract
PARIS. Academy of Sciences, August 29.—M. Mascart in the chair. —On the fall of Perseids in 1904: Henry Perrotin. The most favourable evenings for observations were August 9 to 14. Owing to the exceptional purity of the atmosphere at the summit of Mont Mounier (2740 metres) a large number of meteors were noted. As regards their points of appearance, disappearance, velocity, and brightness, the results clearly indicate the advantages possessed by stations at high altitudes for methodical observations of meteors.—On the approximate solution of certain congruences: Frédéric Riesz.—On the formulæ of tonometry and cryoscopy: E. Ariès. In a preceding communication it has been shown that the expression for the potential of each of the two substances in a dilute solution can be deduced from the law of van't Hoff. In the present paper these results are extended to include the formulæ connecting the alteration of vapour pressure and of freezing point, deduced experimentally by Raoult.—On a case of globular lightning at Autun on July 16: M. Roche.—On the theory of macles: G. Friedel.—The passage from the root to the stem in Primula Auricula: H. Ricome.—Researches on the assimilation of some ternary substances by the higher plants: P. Mazé and A. Perrier. From the experiments described, it is shown that green plants, like fungi and micro-organisms, are capable of assimilating sugars, the only distinction between the two cases being that the former can create these substances at the expense of atmospheric carbon dioxide, whilst in the latter, the nitrous and nitric ferments are the only ones known to be able to take carbon from carbonic acid.—On the preservation of flour by cold: M. Balland.
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Societies and Academies . Nature 70, 476 (1904). https://doi.org/10.1038/070476a0
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DOI: https://doi.org/10.1038/070476a0