Academy of Sciences, October 19.—M. A. Chatin in the chair.—The President announced the death of M. Trecul, Member of the Botanical Section, on October 15.—New researches relating to the decomposition of sugars, under the influence of acids, and especially with the production of carbonic acid, by MM. Berthelot and G. André. The experiments were partly conducted in sealed tubes at 100°, partly in open flasks, at the boiling point. Estimations were made of carbonic acid, carbon monoxide, formic acid, levulic acid, humic acid, and unattacked glucose. Besides glucose, experiments were carried, out with levulose, galactose, and maltose. The principal reaction appears to be the formation of humic acid; carbonic acid is also formed in not inconsiderable quantity.—Determination of the magnetic elements at sea. Applications of the observations made by M. Schwerer on the Dubourdieu, by M. E. Guyon.