PARIS Academy of Sciences, March 19 (CM., 198, 1089-1192). The president announced the deaths of Camille Matignon, D. H. Scott and W. M. Davis. E. FICHOT: Poincare waves of the second species. J. COSTANTIN: Exteriorisation of degenerations by the action of altitude. Discussion of the effects of growth at high altitudes on plant diseases. A. GOSSET, JOSEPH MAGROU and A. TCHAKIRIAN: The action of various elements on the bacterial tumours of Pelargonium. Of various elements introduced, only salts of germanium showed a selective action on the tumours, and the effect was not permanent. GABRIEL BERTRAND and PIERRE SERBESCA: Does the daily injection of small quantities of aluminium favour cancer? The author's experiments on rabbits lend no support to the view that aluminium is toxic and predisposes to cancer. M. HAIMOVICI: The general spaces which correspond point by point with conservation of the parallelism of Cartan. SERGE ROSSINSKI: A transformation of minimal surfaces. ALFRED ROSENBLATT: A bi-harmonic non-linear equation with two independent variables in a general domain. G. VRANCEANU: A classification of the equations of a Pfaff system. B. DE KEREKJARTO: The regularity of the transformations of a simply transitive continued group. N. LUSIN: A new property of measurable B ensembles. MLLE. H. SZMUSZKOWICZOWNA: A theorem on polynomials and its application to the theory of quasi-analytical functions. E. VESSIOT: The refraction and reflection of waves. FLORIN VASILESCO: A manner of considering the study of plane movements with ridges independently of the theory of functions with complex variables. ANTOINE APPERT: Some remarks on the Poisson stability in the Poincare sense. CRES.TIN and CAMPREDON: Study of the deformations and of the distribution of the internal forces in a piece of wood by means of an adherent film. Description of a method applicable to material to which, on account of non-isotropic properties, photoelastic methods are inapplicable. Louis BESSON: Total radiation measured by the Bellani lucimeter. L. DTJNOYER: The expansion of fused silica. A negative coefficient of expansion of fused silica over a certain range of temperature has been proved. ANDRE EGAL: Thermoelectric meter compensated for all fluids. An instrument for measuring the rate of flow of fluids is described and illustrated. RENE REULOS: The deduction of the laws of electrodynamics starting from certain solutions of the equation of electric waves. MLLE. M. QUINTIN and A. LEBETTRE: Study of the chain: lead, lead sulphate, copper sulphate, copper. A. PORTEVIN, E. PRETET and H. JOLIVET: Displacement of the Curie point with concentration in iron-nickel-tungsten (or molybdenum) austenites. PIERRE CHEVENARD: The thermomagnetic study of the heterogeneity of an iron-nickel-carbon-chromium austenite after precipitation of the carbide after annealing. EMILE HENRIOT: The couples exerted by circularly polarised light. GILBERT CAHEN: A method of calculation for thick glass projector mirrors. G. SANNIE: A recording photoelectric photomicrometer with neither slit nor amplification. GUY EMSCHWILLER: The chemical action of light on the diiodo-derivatives of hydrocarbons: the diiodoethenes. P. MONDAIN-MONVAL and RENE PARIS: The thermometric study of the formation of inorganic complex compounds, Results of a calorimetric study of the formation of mercury potassium iodide, and of the double cyanides of nickel, zinc and cobalt. E. ROUYER: The cryoscopic determination of the total hydration of the ions of strontium chloride. PAUL RENAUD: A new compound of phosphorus, nitrogen, oxygen and hydrogen. The hydrolysis of the compound PN, obtained as a product of the reaction between phosphorus trichloride and ammonia, gives a new compound, H2NO2P, the properties of which are recorded. H. MURAOUR and W. SCHUMACHER: The combustion of compressed mercury fulminate in a vacuum. JACQUES DE LAPPARENT: The deposition and geological position of the bauxites of Greece. PIERRE COMTE: The layers intermediate between the Silurian and Devonian in Asturia. LEFEVRE: The division and elongation of the cells in the genus Closterium. RAYMOND-HAMET: The presence of entirely woody supernumerary bundles in the cortical parenchyma of Echeveria: HENRI PRAT: Remarks on the epidermal characters of the American species of the genus Agropyrum. MARC SIMONET: The regularity of the chromatic reduction and the perfect pollen constitution of a hybrid between species with unequal numbers and aneuploids of chromosomes (Iris autosyndetica). M. M. JANOT: The action of the female crystallised hormones on the development of some plants. Equiline, equilenine, folliculine and dihydrofolliculine force the growth of hyacinths and lilies of the valley. AD. DAVY DE VIRVILLE: Observations and experiments on the variations of alkalinity in sea-water pools. JULES AMAR: Diuresis and metabolism. PAUL WINTREBERT: The laws of epigenesis in amphibians. MLLE. IRENE GOLDBERG and JACQUES MONOD: The role of the symbiotic chlorellse in the nutrition of Paramecium bursama. LEON BINET and GEORGES WELLER: A new method for the estimation of glutathione. The method is based on the insolubility of a compound of glutathione with cadmium. MLLE. BERTHE DELAPORTE: The structure and process of sporulation of Oscillo-spira Guilliermondi. MAURICE DOLADILHE: Some physical properties of blood serum.