PARIS. Academy of Sciences, August 17.—M. Henri Deslandres in the chair.—G. Humbert: The expression of a non-Euclidean area of the fundamental domain related to an indefinite Hermite form.—T. Carleman: Singular integral equations with a real and symmetrical nucleus.—M. Galbrun: The deformation of a helical spring the extremities of which are constrained.— L. Barbillion and M. Dugit: A new class of measuring apparatus for the direct evaluation of magnitudes which are functions of two variables. Forms of apparatus now in use, based on the determination of the position of intersection of two rectilinear needles with reference to a curve, are liable to errors of parallax which are difficult to reduce. The type now described is based on the use of a rectilinear needle and a curved needle rotating on a common axis. Two examples of application of the method are suggested: speed indicators for aeroplanes and control of carburettor in internal-combustion motors.—C. Nord-mann: The absorbing powers of the atmospheres of stars. A method of comparing them and of determining the minimum numerical values.—H. Gault and R. Weick: A case of isomerism in the series of the aromatic α-keto-acids. In addition to the two isomers of phenylpyruvic acid described by the authors in a recent paper, a third isomer has now been isolated, and the conditions under which these isomers can be transformed into the other forms have been worked out. A study of the reactions of these three compounds leads to the conclusion that two are stereo-isomers possessing the enolic form, and the third is the ketone.— R. Fosse: The synthesis of a second diamide, oxamide, by the oxidation of sugar and ammonia. Oxamide has been isolated as one of the products of oxidation of cane-sugar in presence of ammonia by calcium permanganate.—MM. Tiffeneau and Orékhoff: The hydrobenzoin transformation. The influence of the nature of the reagent. With the exception of the case of triphenvlglycol, which reacts in the same manner with different dehydrating agents, according as strong or dilute sulphuric acid is emploved, the dehydration of the alkyihydrobenzoins may take place in various ways.—H. A. Brouwer: The nature of the diamond-bearing conglomerate of Diamantina, Brazil.— P. W. Stuart-Menteath: The tectonic of the Western Pyrenees.—J. Kunstler: A treatment preventive of oidium. A handful of sulphur is distributed round the roots of the vine at a depth of 10 to 20 cm.— P. Wintrebert: The time of appearance and mode of extension of the sensibility at the surface of the tegument in fishes and amphibians.—C. Levaditi: An attempt at the culture of the organism of syphilis in, symbiosis with the cellular elements. The culture in vitro, in contrast with the virus of poliomyelitis and rabies, not only did not grow, but rapidly lost its vitality and virulence.—F. Grenet: The appearance of alcoholic yeast in vineyards. It was noted by Pasteur in 1878 that although mould-spores could be found on the stems of the vines and in the soil at all periods of the year, alcoholic yeast appeared only at the time the grape ripened. The cause of this has now been traced to the fly, Drosophila melanogaster, which carries the yeast-spores, and appears in the vineyards only when the grapes are ripe. The origin of the fly has not been traced, nor is it known whence it obtains the yeast-spores.—E. Joltrain: The value of Bordst's fixation reaction in the diagnosis of plague. This reaction has rendered great service in cases of doubt in convalescents, and when search for the bacillus has given negative results.—C. Gessard: Sub-races of the pyocyanoid bacilli.—L. Scheffler, A. Sartory, and P. Pellissier: The use of silicate of soda in intravenous injections: physiological and therapeutical effects. Sodium silicate solutions may be utilised for intravenous injection in doses worked out empirically. The treatment is beneficial in cases of arterio-sclerosis, in cardio-renal troubles, and in chronic rheumatism. The treatment of tuberculosis by this method is under consideration.