Abstract
PARIS.Academy of Sciences, August 25.—On a jawbone of a Greenland seal, found by M. Michel Hardy in the grotto of Raymonden.—Observations of the Denning (July 23, 1890) Comet, made at the Paris Observatory, by M. G. Bigourdan.—Observations of the new planet Palisa (Vienna, August 17, 1890), made at the Paris Observatory, by Mdlle. D. Klumpke.—Elements and ephemerides of the planet 294, discovered at the Nice Observatory, July 15, 1890, by M. Charlois.—On two forms of electrical gyroscopes, one serving to show the movement of the earth, and the other for the rectification of the marine compass, by M. G. Trouvé. The two instruments are similarly constructed, but the latter is heavier, and so hung as to be free from the various causes of disturbance always present on board. It is able to correct the compass with certainty, since its axis of rotation remains fixed in space, however long it is necessary to prolong the observation.—On the respiration of the grasshopper, by M. Ch. Contejean. The abdomen is chiefly concerned with the respiratory movements. Stimulation of the nervous system by applying induced electric currents causes an obvious acceleration in the breathing.—New researches on the production of light by animals and vegetables, by M. Raphael Dubois. The author concludes that the production of light in animal organisms is due to the transformation of the colloidal protoplasmic granulations into crystalloidal granulations, under the influence of a respiratory phenomenon.—On the presence of the carboniferous formation in Brittany, by M. P. Lebesconte. This paper contains a list of the fossils obtained from some newly-discovered fossil-bearing strata in the carboniferous limestones at L'llle-et-Vilaine in Quenon.—On the storm of August 18, 1890, at Dreux, by M. Léon T. de Bort. In its local and destructive character this storm showed many analogies with the tornadoes of the United States.—Notes were also submitted by M. Chapel, on the coincidence of atmospheric disturbances with the meeting with the Perseids; by M. van Heyden, on the height of the atmosphere; and by M. E. Mathieu-Plessy, on a new base obtained by heating ammonium nitrate, possibly nitramide, NO2. NH2.
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