Abstract
PARIS. Academy of Sciences, July 24.—M. Troost in the chair.— H. Deslandres: Remarks on the movements of the solar prominences. The author regards the upper layer of the solar atmosphere as being ionised and under the action of a magnetic field. This field causes movements in the solar ions, especially those rising and falling. The theory ex plains easily all the observed peculiarities of the velocity of rotation in the prominences and the upper layer. In the present paper some further consequences of this theory are developed, and a scheme of research suggested for its control.—A. Laveran and M. Roudsky: Concerning the action of oxazine (triaminophenazoxonium chloride) on trypanosomes. The selective action of the centrosomes of the trypanosomes for oxazine, noted by Werbitzki, takes place both in vitro and in vivo. The disappearance of the centrosomes in T. brucei, and the fact that this morpho logical modification can be transmitted by heredity, is con firmed. Other species are similarly affected, but to vary ing degrees. The virulence of the trypanosomes submitted to the action of oxazine is reduced.—R. Zeiller: A Triassic flora discovered at Madagascar by M. Perrier de la Bathie.—Emile Belot: The period of rotation of Venus. The observed period of rotation of Venus has been recently given by M. Bigourdan as twenty-nine hours. The author points out that in a communication to the academy in 1906 he gave a general formula from which this period was deduced to be 28h. iam.—M. Giacobini: Observations of the Brooks comet (1911c) made at the Observatory of Paris. Data given for July 22 and 23.
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Societies and Academies . Nature 87, 169–170 (1911). https://doi.org/10.1038/087169a0
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DOI: https://doi.org/10.1038/087169a0