Abstract
PARIS. Academy of Sciences, August 7.—M. Paul Appell in the chair. C. Richet; The monthly variation of natality. For a period of fifty-seven years the maximum number of births is in February or March. For the years 1906–10 the. maximum in these two months is shown in all countries in the Northern Hemisphere, and figures for eleven countries are cited. In the Southern Hemisphere the monthly maximum is in August-October, or a period six months from the maximum in the Northern Hemisphere. The maxima are in the same months both for legitimate and illegitimate births, for rural and urban populations, for the poor and rich; but a relation can be traced between the latitude and the date of the monthly maximum.—C. Camichel: Hammering in water mains: the examination of the state of a main. P. Choflat: The volcanic intrusive rocks of the region situated to the north of the Tagus.—E. Belot; Experimental volcanoes and the laws of volcanic phenomena. The experimental arrangement described in an earlier com munication can be modified by the introduction of a layer impermeable to water and steam (slate) above the source of heat.—R. Souèges: The first divisions of the egg, and the origin of the hypophysis in Capsella bursa-pastoris.
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Societies and Academies . Nature 97, 536 (1916). https://doi.org/10.1038/097536a0
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DOI: https://doi.org/10.1038/097536a0