PARIS. Academy of Sciences, July 26.—Gabriel Bertrand and M. Mâchebœuf: Nickel, cobalt and diabetes. Injections of saline solutions containing small quantities of these two metals in some cases of diabetes proved to be without effect; in others, there was a marked improvement. Administered by the mouth, in one case of diabetes, the amount of insulin injected daily could be reduced by 25 per cent.—Rateau, Leroux and Bourgeat: The experimental determination of the coefficient of yield of tuyeres working with a free flow.—Kyrille Popoff: The convergence of series in ballistics.—E. M. Antoniadi: Changes recently observed on the planet Jupiter with the 83 cm. telescope of Meudon Observatory. A detailed description of recent changes in the surface of the planet, with two reproductions of photographs.—Léon Brillouin: A general type of problems, allowing the separation of the variables in the undulatory mechanics of Schrodinger.—Louis de Broglie: Remarks on the new undulatory mechanics.—Lucien Mallet: The luminescence of water and organic substances submitted to γ-radiation. Under the influence of the γ-rays, water and certain transparent organic liquids exhibit a marked luminescence. The light from water contains ultra-violet rays of wavelength less than 3000 Å.U.—F. Wolfers: A probable action of matter on the quanta of radiation.—Pierre Auger and Francis Perrin: The distribution in space of the directions of emission of the photo-electrons.—Rodolphe Berthon: The projection and reproduction of reticulated photographs.—Pierre Thomas and Mile. Mari Sibi: Contribution to the study of the structure of jellies. Organogels obtained with the benzoylacetal of sorbite.—P. Dumanois and P. Laffitte: The influence of the pressure on the formation of the explosive wave. From experiments (2H2 + O2) with initial pressures from i to 6.5 atmospheres, the distance travelled by the flame before the explosive wave is set up diminishes as the pressure increases, at first rapidly and then more slowly.—Michel O. Samsoen: The dilatometric and thermal study of glasses composed of silica and soda.—Marcel Laporte and Mario A. da Silva: The mobility of the negative ions and ionisation currents in pure argon. From the results of earlier work, it was concluded that in perfectly pure argon the saturation current would be obtained with a much lower potential difference than in air: this prediction is now confirmed experimentally. The curves given show that saturation is obtained in highly purified argon at 50 volts, whilst in air, saturation is not reached at 1760 volts. The effect of impurities on the ionisation curve of argon is shown.—Georges Deniges: The action of hydrobromic acid and of the alkaline bromides in acetic acid solution on cupric bromide. A new cupric reaction. The reaction is based on the colour produced by the addition of a cupric salt to pure acetic acid containing some potassium bromide.—A. Travers and Malaprade: The constitution of solutions of molybdic acid. Solutions of molybdic acid contain a condensed acid, 4MoO3. H2O, which, by analogy with metatungstic acid, may be called metamolybdic acid.—R. Cornubert and Ch. Borrel: The action of benzaldehyde on cyclanones containing the groups -CH(CH3).CO.CHR— or —CHR.CO.CH2—.—G. Bruhat and V. Thomas: The dimagnesium compounds containing the benzene nucleus. An account of the general reactions of compounds of the type C6H4(MgI)2.—G. Vavon and Jakes: The catalytic hydrogenation of conjugated double bonds. So far as concerns the addition of hydrogen by the catalytic method, the presence of a system of conjugated double bonds does not entail any special ease of hydrogenation, and does not permit partial hydro-genation in the 1: 4 position. From this point of view, there are marked differences between the catalytic and nascent hydrogen methods of reduction.—Marcel Sommelet: A mode of preparation of tertiary amino derivatives of tertiary alcohols.—V. Ipatief and B. Dolgof: The hydrogenation of tri-phenylcarbinol and of phenylfluorenecarbinol under pressure. The end product of this reaction is tri-cyclohexylmethane (C6H11)3CH, the analysis and physical properties of which are given. The product previously described under this name by Godchot is shown to have been impure.—L. Léger and F. Blanchet: The grit formations of the isles of Pbrt-Cros and of the Levant.—E. Rothé, J. Lacoste and Mme. A. Hée: Earthquakes in France in 1925. There were twelve earthquakes in France in 1925, only half the number in the preceding year. Details of the distribution and intensity are given.—Lucien Mayet: The fossil men of the Denise: the masculine frontal bone (the Frontal Aymard of the Crozatier Museum) at the Puy, Haute-Loire. A detailed study of this bone shows it to be clearly of the type Homo sapiens, and presents archaic characters in the sub-orbital region which are only found to-day in the most primitive existing race, the Australian aborigines.—Michel-Durand: The physiological rôle of the tannins.—Antonin Němec: A chemical method for determining the phosphoric acid requirements of agricultural soils.—Mme. Anna Drzewina and Georges Bohn: The influence of carbon dioxide on the sperm of the sea-urchin, as a function of the mass.—Max Aron: Experimental facts relating to the harmony of growth in the larvæ of frogs.—Charles Dhere and Elphege Bois: The comparative study of the fluorescence of some natural and artificial porphyrins.—Beguet: The mechanism of agglutination (as regards Br. melitensis).—R. Boyé: The comparative action of quinine stovarsolate and chlorhydrate in quartian marsh fever.—F. Rathery and Mile. L. Levina: The influence of salts of nickel and cobalt on some diabetic patients. Detailed accounts of the treatment and results with eleven patients.