Academy of Sciences, October 1 (CM., 199,621-648). PAUL LEVY: The asymptotic properties of sums of linked contingent variables. M. GHEBMANESCO: The theorem of Picard. DIMITBI RIABOUCHINSKY: Some new remarks on the hydraulic analogy of the movements of a compressible fluid, JACQUES VALENSI: Aerial helices: photography of the trajectories. Study of the secondary vortices. RAYMOND AMIOT: The adsorption by oarbon of binary mixtures in aqueous solution. The mixtures studied all included phenol, with either saccharose, mannite, erythrite or glycerol. MIBOSLAV ROMANOW-SKI: The attainment of a 50 per cent hygrometric state round an Otto Wolff standard resistance of lacquered wire, exposed to variations due to in equalities of atmospheric moisture. A standard hygrometric condition for the resistance coils is obtained with solutions of sulphuric acid of density 1-33. The International Bureau has adopted this method, proposed by the Physikalisch-technische Reichanstalt, in preference to using a hermetically sealed container. ANDBE CHBETIEN and PIEBBE LAUBENT: The existence of a frequent type of iodine complex in organic solution. An application of measurements of the dielectric capacity to solu tions of iodine in organic solvents. It is shown that the iodine - pyridine complex contains one molecule of iodine to two molecules of pyridine. Similar com plex compounds were found for other bases. RAY MOND ROHMEB: The hydrates of cobaltous sulphate. C. E. BBAZIEB, I. MASEK and R. GULLHEN: The influence, of the transparency of the atmosphere on the results furnished by the comparison of two pyrheliometers. LEON LAUNOY: The action of cystine on the toxicity of antimony.