Societies and Academies
1911; Nature Portfolio; Volume: 87; Issue: 2184 Linguagem: Inglês
10.1038/087340a0
ISSN1476-4687
Tópico(s)Diatoms and Algae Research
ResumoPARIS. Academy of Sciences, August 28.— M. Armand Gamier in the chair.—Arnaud Denjoy: The Analysis situs of the plane.—Jules Andrade: A new regulator for chronometers. Two spiral springs are employed in the place of one. The use of Arnold's terminal curves is avoided, and the sinusoidal law of the balance spring is maintained.—M. Bourgeois: Determination of the geographical coordinates in the colonies by the use of wireless telegraphy. Trial of the method between Paris (Observatory) and Brussels. A compact and portable form of apparatus is described for the determination of differences of longitude. Full details are given of the application of the method to the measurement of the difference of longitude between Paris and Brussels.—A. G. Webster: A new mixed problem of the telegraphists' equation.—M. Tsvett: A new colour reagent for callose. The blue solution obtained by the spontaneous oxidation by the air of an aqueous solution of resorcinol rendered alkaline by ammonia is proposed as a stain for the distinction of callose in microscopical specimens. Cellulose remains colourless on treating with this reagent; callose is stained blue, an exposure of from thirty to sixty seconds being sufficient. In combination with Congo red, the blue solution is suitable for double staining.—Pierre Kennel: The function of the adipose reserve of the adipo-lymphoid bodies. In Batrachians, the adipose reserve is utilised whenever the animal is exposed to bad conditions of nutrition, particularly during hibernation. This reserve also serves in the development of the sexual elements, especially in the elaboration of the dentoplasm of the egg.—Casimir Cépède: The cycle of evolution and the systematic affinities of the Haplosporidea? of Donax.—Em. de Martonne: The chronology of the Pliocene and Quaternary thalwegs of Arc and Isère.
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