PARIS. Academy of Sciences, June 22.—The president announced the death of Jacob Eriksson, Correspondent for the Section of Rural Economy.—H. Deslandres: Simple relations between the molecular spectrum and the structure of the molecule. A table of the infrared frequencies of gaseous ammonia and carbon dioxide, and a discussion of the data.—Charles Achard and Augustin Boutaric: Some physical properties of the blood serum in lipoid nephrosis. Quantitative measurements of the light absorption and viscosity, before and after heating the blood serum to varying temperatures, are used for determining the changes in the number of particles in the colloidal suspension. The theoretical basis of the method was described in an earlier communication (C.R., 191, 1332).—R. Fosse, A. Brunei, and P. E. Thomas: The quantitative analysis of very small quantities of allantoin at high dilutions. The application to human urine. The method is based on the destruction of urea by the diastases of the soja bean in presence of cyanide, followed by hydrolysis by hydrochloric acid. The glyoxylic acid thus produced from the allantoin is estimated by a colorimetric method with phenylhydrazine; full working details are given.—C. Sauvageau: Three new examples of plethysmothallus (plethysmothalle) (Myriotrichia and Protasperococcus).—Paul Delens: Orthoptic congruences and isotropic congruences.—W. Sierpinski: A property of the limits of ensembles. M. Kourensky: The variation of the arbitrary constants for the integrals of ordinary differential equations of the second order.—Florent Bureau: Holomorph functions in a circle of finite radius and integral functions.—Gabeault: The air resistance to ballistic velocities.—M. Aubert and R. Duchêne: The determination by the photographic method of the resistance of petrols to detonation. D. Barbier: Function of distribution of the eccentricities and mean anomaly of long period visual double stars, the orbits of which have not yet been calculated.—G. Foë and Mlle. B. Kessler: The various magnetic states of the nickel ion in solutions of its chloride. Moderate rise of temperature (to 90° C.) does not influence the magnetic state of the nickel ion, but raised to a higher temperature (100° C.) the Weiss magnetons are lowered.—Horia Hulubei and Mlle. Yvette Cauchois: The monochromatic stimulation of Raman spectra in the ultra-violet. Applications. The monochromatic radiation was obtained by filtering the light from a mercury lamp through chlorine gas under pressure. Details of experimental results with water and ethyl alcohol are given.—P. Dupont: Study of the hydrolysis of sulphate of zinc solutions with the aid of the quinhydrone electrode.—M. Haïssinsky: A new reaction of polonium. Polonium forms an insoluble pyrogallate: in this reaction it resembles bismuth and antimony, but differs from tellurium.—Mile. Germaine Bernheim: The preparation of the cyanamides of the earths and alkaline earths. Study of the reaction
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