PARIS Academy of Sciences, July 18 (vol. 195, pp. 193–292).—L. Blaringhem: Reappearance of fertility in a new variety of wild foxglove (Digitalis purpurea).—Charles Achard, Augustin Boutaric, and Maurice Doladilhe: The dilution of horse serum in electrolytic solutions. In an earlier paper it has been shown that by diluting 1 c.c. of serum to a volume l and measuring the optical density of the solution (h), then lh increases at first, passes through a maximum, and decreases to a limiting value. This work has now been extended to solutions containing salts.—Emile Guyénot, W. Bartschi, and Mlle. K. Ponse: The production of the yellow bodies studied by the method of transplantation of the ovary on to male guinea-pigs.—J. Schauder: The problem of Dirichlet generalised for non-linear equations of the elliptic type.—J. Ottenheimer: The displacement of water and the nature of the waves recorded in submarine explosions.—D. Riabouchinsky: Experimental researches on the formation of cavitations.—Henri Mineur, Mlles. Renée Canavaggia and Marie-Louise Fribourg: The correlation between the velocity of the star mass and their distance in the galactic plane.—René Audubert: The Debye-Hückel theory and electrophoresis.—M. Pauthenier, Mme. M. Moreau-Hanot, and R. Guillien: The charge of small dielectric spheres in an ionised electric field.—J. J. Trillat and Th. v. Hirsch: The diffraction of electrons by single crystals. The case of paraffin and the saturated fatty acids.—Pierre Girard and P. Abadie: The comparison of experiment and theory of dispersion in the Hertzian domain. The theory of Debye requires modification by the introduction of a factor representing the molecular constitution. Ch. Haenny: The magnetic double refraction of salts of the rare earths in aqueous solution. Magnetic constants are given for twelve rare earths.—Pierre Tarbès: Method for the study of joining and expansion of glasses. Compensator for double refraction. If two glasses, possessing different coefficients of expansion are joined, the join may part at once, or possibly after several months. The method proposed measures the strains in the join by double refraction, using a special compensator.—Léonard Sosnovski: The polarisation of the fluorescence bands of cadmium vapour.—Q. Majorana: A new photoelectric phenomenon. Thin films of various metals deposited on glass (gold, silver, platinum, tin) show a variation in electrical conductivity on exposure to light. The effect was not observed with thin films of aluminium or zinc (see also NATURE, 130, 241, Aug. 13, 1932).—Mlle. Y. Cauchois: A new method of X-ray analysis of crystalline powders utilising a monochromator with a curved crystal.—Horia Hulubei: The experimental study of the partial absorption of the X-rays. The author has attempted to repeat the experiments of B. B. Ray, but with negative results.—Pierre Auger: The emission of slow neutrons in the stimulated radioactivity of beryllium. Francis Perrin: The constitution of the atomic nuclei and their spin.—Mlle. M. Pernot: The system mercuric bromide, potassium bromide, and water.—Henri Muller: The lowering of the eutectic point of ice - potassium nitrate, by acids, bases, and acid salts.—Desmaroux and Mathieu: Remarks on the structure of films of nitrocellulose with high nitrogen content.—Charles Lapp: The rotatory power of quinine in alcoholic solution. The specific rotatory power of quinine in alcoholic solution varies with the concentration. The facts are consistent with the hypothesis that the molecules of dissolved quinine form two groups, one in which each quinine molecule is associated with 40 alcohol molecules, the other group containing free quinine molecules. Lespieau and Guillemonat: A new isomer of benzene, CH2:CH.C:C.CH:CH2.—Jacques Sordes: The absorption in the ultra-violet of the hydrocarbons (CH3)3C6H2 (CH2)n. C6H2(CH3)3.—G. Hugel and M. Lerer: The synthesis of alkyl aromatic hydrocarbons. The synthesis is based on the interaction of the hydrocarbon (napthalene, anthracene) with alkyl halide in liquid ammonia in the presence of sodium.—R. Cornubert and G. Sarkis: Contribution to the study of the extinction of the ketone function and the theories put forward to explain this phenomenon.—Lucien Semichon and Michel Flanzy: The application of chromic oxidation to some alcohols.—Jacques de Lapparent: The classification of the sedimentary clays.—Henri Vincienne: The flaky structure of the Ambérieu region (western edge of the southern Jura) and the age of the last Jurassic movements. Fernand Daguin: A Cretaceous flora in the neighbourhood of Tissa (western Morocco). Maurice Hocquette and Mlle. Raymonde Villard: The action of saturated ether vapour on the quiescent and dividing nuclei of the seedlings of Raphanus sativus.—L. Plantefol: The power of concentration of the cytoplasm. The formation of crystals by pollen grains, starting with neutral red. E. Miège: The influence of various factors on the development of the inflorescence of cereals.—B. Demetrović The effect of Mach's law. A discussion on the possibility of this effect being partly physiological and partly physical (diffraction).—G. Tanret: The hyperglycemic action of hordenine sulphate. Hordenine, in sufficient doses, possesses the hyperglycemic action of the true sym-pathomimetic substances (adrenaline, ephedrin).—Marcel Avel: The experimental analysis of the disappearance of the power of regenerating a head in the middle region of the body in Lumbricus.—A. Mache-bœuf G. Sandor, and C. Nini: Physico - chemical studies on the filtrates of acid - resisting bacilli of tuberculosis and of fleole.—Mme. L. Gruzewska: The α-lipase and amylase in the blood of some Crustacea.—G. Champetier: The fixing of water by cellulose. By a physico-chemical method, it is shown that cellulose fixes half a molecule of water per hexose group (C6H10O5), whilst mercerised coaltar fixes double this amount.—Maurice Piettre and André Guilbert: The influence of electrolytes, especially sodium chloride, on the proteins of serum. The dispersion of myxo-protein in solutions of common salt cannot be explained by an adsorption of salt by the protein.—Jacques Parrod: The oxidation products of levulose in ammoniacal solution by methylene blue and atmospheric oxygen, at laboratory temperature. The products of this oxidation were 4- methoxy imidoazol, d-4- arabinotetroxybutylimidoazol, and a new substance imidoazol-4-formamide.—Jean Cheymol and Alfred Quinquaud: The exchanges of normal calcium in dogs deprived of their genital glands. Subsequent ablation of the parathyroids in the female dog results in the usual reduction of calcium in the serum.—Joseph Lignières: A new method of immunisation against diseases with filtrable viruses; its application to antiaphthous vaccination.
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