Abstract
PARIS. Academy of Sciences, September 20.—M. Léon Guignard in the chair.—H. Lecomte: The radial secretory canals of wood. The usual direction of these canals in the tissues of the stem and root is parallel to the length of the organ, but a system of radial secretory canals may, in a large number of plants, be superimposed on the longitudinal system. These radial canals have been noted by Trécul and others, but have hitherto been regarded as exceptional cases. In the genera Pinus, Picea, and Larix the radial canals are now found to be present in all cases, and numerous examples were also found in other species.—P. Humbert: Hypercylindrical functions in space of n + 2 dimensions.—J. Soula: Remarks on the investigation of the singular points of a function denned by a development in Taylor's series.— J. Andrade: The geometrical interpretation of the Résal-Caspari method.—A. Véronnet: Values of the flattening of the earth obtained by calculation and by measurement.—A. Buhl: The formula of Stokes in space-time.—M. Flajolet: Perturbations of the magnetic declination at Lyons during the second half of 1919 and the first half of 1920. The observations are tabulated in six groups between calm davs and perturbations greater than 30′. On August 11, 1919, and March 4, 1920, the disturbances were very large and outside the scale of the recorder.—H. Coupin: The resistance of seedlings to starvation. The seedlings of seventeen species of plants grown in the dark in distilled water lived from fifteen to sixty days—F. Viès: The production of difference spectra of toxin cultures. Further study of the changes produced in the absorption spectra of toxin cultures by heating and by the addition of antitoxin.—C. Lebailly: The prevention and treatment of aphthous fever by the serum or blood of cured animals. Experiments were made on more than five hundred animals. The immunity produced by the injection was of very short duration, in some cases less than fifteen days. Good results were obtained in the treatment of infected animals, provided that the injections were made as soon as possible after the disease was recognised.
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Societies and Academies. Nature 106, 231 (1920). https://doi.org/10.1038/106231a0
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DOI: https://doi.org/10.1038/106231a0