Abstract
PARIS. Academy of Sciences, October 1.—M. Camille Jordan in the chair.—M. Angelesco; A method of summation of trigonometrical series.—W. Sierpinski and N. Lusin: A decomposition of an interval.—Q. Majorana: Experimental demonstration of the constancy of the velocity of light reflected by a mirror in motion.—C. Benediks: The thermo-electric effect by contraction in the case of mercury. The thermo-electric effect described by the author in an earlier paper may be regarded as the reversal of the Thomson effect. It is, however, open to the possible objection that the effect observed may be due to the non-homogeneity of the metal wire employed; a similar effect is now demonstrated with pure mercury, in which case this objection cannot apply.—M. Siegbahn and W. Stenstrom: The X-ray spectra of the isotopic elements. A comparison of the X-ray spectra of RaG and ordinary lead has proved their absolute identity.-P. Dejean; Martensite, troostite, sorbite. A discussion of the definition of these micrographic constituents of steels.—L. C. Soula: A new method of graphically recording in physiology. The method is based on the principle that if a battery, microphone, and solenoid are placed in circuit, and a magnet is put in the axis of the solenoid, any varia tion of resistance produced in the microphone by ex ternal pressures produces corresponding modifications of the magnetic field, and a piece of soft iron carrying a writing point placed before the magnet gives a record of the pressures.—V. Galippe: Parasitism in toxic seeds or seeds rich in essential oils. The pre sence of micro-organisms was found to be general in both classes of seeds.—Edm. Sergent and Et. Sergent: A new method for the destruction of mos quitoes by alternation of their breeding-grounds. The life of the larva of the mosquito in the Mediterranean climate is from sixteen to twenty-five days before the metamorphosis into the winged insect. In the case of a spring, around which a breeding-bed of mosquitoes is liable to form, it is sufficient to dig out two channels and every eight days to change the water from one to the other. During the week the soil dries and the larvEE die for want of water. This method has given excellent results in Algeria, requires slight supervision, and costs little.—G. Bertrand: The digestibility of bread and the best utilisation of wheat. A comparison of existing data for white bread (72 per cent, extraction), wholemeal bread (100 per cent, extraction), and the intermediate (85 per cent.), taking into consideration the calorific value of the digested portion and the feeding of farm animals on the wheat offal, leads to no definite conclusion from a theoretical point of view.-H. Vincent: Results of antityphoid vaccination in the armies during the war.—C. Levaditi and L. Delrez: The cutaneous origin of the streptococci found in war wounds.
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Societies and Academies . Nature 100, 139–140 (1917). https://doi.org/10.1038/100139a0
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DOI: https://doi.org/10.1038/100139a0