Abstract

PARIS. Academy of Sciences, September 13.—M. Bouchard in the ochair.—H. Deslandres communicated a telegram from P. Lowell, stating that the presence of free oxygen has been proved in the atmosphere of Mars. The oxygen band B is clearly stronger in the Mars spectrum than in that of the moon.—The movements of the upper solar atmosphere above and round the faculae. The cellular vortices of the sun: H. Deslandres. Details of the work done with the new spectrograph at the Observatory of Meudon. A diagram is given showing the radial movements of the upper K3 layer of the solar atmosphere above and round a facula.—The study of sea temperatures: A. Bouquet de la Grye. A knowledge of the temperatures of the sea over a wide area is an important factor in weather forecasts.—The trypanolytic power of the blood of some coldblooded vertebrates with respect to Trypanosoma evansi: A. Laveran and A. Pettit. The blood of some of the cold-blooded vertebrates contains active trypanolytic substances, and there seems to be a relation between the presence of these substances and the toxicity of the serum. Closely related vertebrates showed differences in the trypanolytic power, the case of Rana esculenta and R. temporaria being especially remarkable in this respect.— The problem of Sophus Lie: N. Saltykow.—Practical formulas for the calculation of aerial helices: M. Drzewiecki.—The magnetic rdle of oxygen in organic compounds: P. Pascal. The constants given in this paper enable the value for the magnetic susceptibility of an organic compound containing oxygen to be used as a guide to its structure.—The estimation of phosphorus in combustible substances by the calorimetric bomb: P. Lemoult. If certain precautions are taken, details of which are given, the determination of phosphorus in organic compounds by combustion in the calorimetric bomb possesses advantages over the methods in general use both in rapidity and accuracy.—The law of the fading of mnemonic traces as a function of the time in Limnaea stagnalis: Henri Pieron.—The natural means of defence of certain cold-blooded vertebrates against the trypano-some of surra, Trypanosoma evansi: A. Massagrlia. Phagocytosis appears to play no part in the destruction of the trypanosomes.

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