Abstract
PARIS. Academy of Sciences, August 23.—M. Ed. Perrier in the chair.—G. Humbert: The reduction of the forms of Hermite in an imaginary quadratic body.—MM. Costantin and Bois: Three types of commercial vanilla of Tahiti. Since three-fifths of the world's production of vanilla comes from the French colonies, the question of its culture is worthy of investigation. The fruit from Mexico and Reunion is superior to that of the Tahiti type. In the present note a comparison is made between the types of vanilla known under the names of Mexico, Tahiti, and Tiarei, and some practical suggestions are made for cultivation.—Paul Vuillemin: The staminal origin of the perigon of the Liliaceæ; proofs furnished by the flowers of Hemero-callis.—E. F. Perreau: An electro-vibrator worked with interrupted currents. Previous types of this1 instrument, used in surgical work, have been worked with an alternating current, but an interrupted continuous current may be also used with advantage. Details of the arrangement are given, which, for the detection of non-magnetic bodies, is superior to the original instrument.—Daniel Berthelot: The co-volume of the gases disengaged by explosive materials. The co-volume b, in the equation p(v- &) = RT, is usually taken as o.ooi in calculations relating to explosives. It is now shown that this only holds for gases the critical temperature of which is sensibly equal to four times the critical pressure.—M. Guilbaud: An apparatus for the photolysis of powders.—J. Repelin: The Cretaceous age (Begudian) of the detritic layers of Logis de Nans (Var).—Henry Hubert: Subterranean waters in western Africa. A chart of Senegal is given showing the depths of the underground water.—Jules Amar: Arthrodynamometric measurements. — H. Vincent: Typhoid toxin and the production of a specific serum against typhoid fever. A study of the conditions for obtaining cultures of high toxic power.
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Societies and Academies . Nature 96, 27–28 (1915). https://doi.org/10.1038/096027a0
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DOI: https://doi.org/10.1038/096027a0