Abstract
PARIS. Academy of Sciences, September 20.—M. Bouchard in the chair.—Multiple monochromatic images of the sun given by the large lines of the spectrum: H. Deslandres and L. d'Azambuja. A historical account of the study of the different layers of the solar atmosphere by means of monochromatic images of the dark lines. In the present paper an account is given of new work, in which the successive layers of iron, calcium, and hydrogen have been distinguished. The upper layers, the most interesting but the most difficult to isolate, have been specially studied, the large spectroheliograph with three slits, built in 1907, having been of great service in this connection.—The earthquake of June n, 1909: Alfred Angot. A map is given of the district affected, showing the zones, of equal disturbance.—The action of mineral waters on the striation and form of the valves of diatoms: A. Lauby.—The washing of cider apples with an oxidising calcium salt, leading to a pure fermentation: Henri Alliot and Gilbert Gimel. It has been shown that washing the apples with a weak solution of calcium hypochlorite is very advantageous.—The preventive action of normal serum from the sheep on Trypanosoma duttoni: A. Thiroux.—Calculation of the depth of seismic hypocentres: Comas Sola.
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Societies and Academies . Nature 81, 420 (1909). https://doi.org/10.1038/081420a0
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DOI: https://doi.org/10.1038/081420a0