Societies and Academies
1910; Nature Portfolio; Volume: 84; Issue: 2137 Linguagem: Inglês
10.1038/084488a0
ISSN1476-4687
Tópico(s)Chemical Thermodynamics and Molecular Structure
ResumoPARIS. Academy of Sciences, October 3.—M. Émile Picard in the chair.—The president gave an account of the lifework of the late M. Maurice Lévy.—Émile Picard: A singular functional equation of the Fredholm type of equation Charles Lederer: The organic compounds of tetravalent tellurium. By the interaction of tellurium tetrachloride and magnesium phenyl bromide in ethereal solution there is obtained chlorobenzene, diphenyl, the com pound Te(C6H5,)3 already described by Kraft and Lyons, and a new derivative, triphenyl-telluronium chloride, the iodide of which, (C6H5)3 Tel, was prepared by adding potassium iodide. The bromide (C6H5)2 TeBr2 is also formed in the reaction.—L. Gay: The osmotic equilibrium of two liquid phases.—A. and L. Lumiere and M. Seyowetz: The action of quinones and their sulphonic derivatives on the photographic images formed by silver salts. Aqueous solutions of benzoquinone in presence of sulphuric acid are useful in reducing over-exposed negatives; the replacement of the sulphuric acid by potassium bromide gives a new intensifying solution. The suitable proportions are given in both cases.—Charles Janet: The sensitive organs of the mandible of the bee.—Paul Godin: Normal asymmetry of the binary organs in man.
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