PARIS. Academy of Sciences, July 28.—Deslandres: The raies ultimes of the alkalis and alkaline earths.—Bigourdan: The observatory of Courtanvaux at Colombes.—L. Blaringhem: The influence of the pollen on the movements which precede the opening of the flowers in poppies.—J. Costantin: The increase in resistance to disease (of plants) due to altitude. The resistance of cultivated plants to disease is increased when the plant is grown at a high altitude. The results with potato, sugar cane, and coffee plant are cited.—Ch. Gravier and P, Mathias: The reproduction of a phyllopod crustacean of the group Conchostriaceae (Cyzicus cycladoides).—Paul Pascal and Erling Botolfsen: The synthesis of methane starting with carbon monoxide and steam. In presence of a nickel catalyst, the reaction between carbon monoxide and steam depends upon the temperature. At 275° C. the reaction is 4 CO + 2H2O-3CO2 + CH4, but at 750° C and upwards the well-known reaction CO+H2O>COg + H2 occurs.—E. Mathias and G. Grenet: The daily variation of the electric field of the air at the observatory at the coast of Landais. The results agree with those obtained at the summit of the Puy de Dome and at Val Joyeux in showing daily two maxima and two minima of unequal importance. The amplitude of the daily variation is considerable at the lower station, the ratio of the maximum to the minimum being 3 for the summer, 2-1 for the spring.—Paul Delens: The geometry of connected cycles.—Jean Pierre Robert: Limited formulae of mediation.—S. Sonoda: Radiation resistance of a small antenna oscillating in half waves.—L. Brillouin: The electrons in metals and the role of the conditions of Bragg's selective reflection.—Jean Thibaud and F. Dupre La Tour: Study of the a and j8 crystals of the fatty acids.—J. J. Trillat and A. Nowakowski.: The orientation of the fatty acids in contact with a liquid phase. It is shown that using the method of the tangent drop, it i& possible to follow the various factors which govern the formation of crystals and the orientation of the molecules of fatty acids in contact with various liquids.—George I. Costeanu: Batteries with a sodium cathode.—Guy. Emschwilier: The absorption of ultra-violet light by the alkyl iodides. Details of quantitative measurements by the photographic method, using the recording microphotometer of Lambert and Chalonge. The substances studied included methyl, ethyl, propyl, butyl, isopropyl, isobutyl, secondary butyl, and tertiary butyl iodides and iodobenzene: these were examined as liquids and as gases.—Mile. L. Popovici: Naphthyl-j3-glyoxylie acid and some of its derivatives.—Albert Saint-Maxen: The autoxidation of hydroquinone. To a solution of hydroquinone, sodium hydroxide is gradually added. Curves are given showing the light absorbed, the electrical conductivity, and the oxidation velocity as functions of the amount of alkali added.—Ch. Courtot and V. Ouperoff: The systematic study of the condensation of the aromatic monoketones with the tertiary aromatic amines, under the action of aluminium chloride.—Jean Lugeon: Ionisation and electric field at El Golea: lightning visible at 800 kilometres: mirages seen from a motor car: condensations in the dunes of the Grand Erg.—Rene Girard and Robert Lemesle: Structural peculiarities of the floral axis of Ramondia pyrenaica.—Mile. Lucienne George: Some anatomical peculiarities of Gnetum.—Aug. Chevalier: The mycocecidia of the gyrophore of Arachis.—Fernand Mercier: A new water soluble derivative of camphor and of sparteine: sparteine camphosulphonate.—M. Javillier and Mile. L. Emerique: A method of purification of carotene and the vitamin activity of a purified carotene. A carotene purified by five repetitions of a process described, and melting at 185° (the melting point given by Drummond for his pure but physiologically inactive carotene), still possesses powerful vitamin properties.—Edm. Sergent and H. Ducros-Rougebief: The preservation in Nature during the winter of Droso-phila, carriers of yeasts.—A. Leulier and P. Sedaillan: The affinity of the diphtheria bacillus for copper. The diphtheria bacillus is not injured by small proportions of copper sulphate and fixes this metal in notable amount.—Charles Benoit and Andre Hel-bronner: Photochemical therapeutics.