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Article
November 25, 1922

BERLIN

JAMA. 1922;79(22):1864-1865. doi:10.1001/jama.1922.02640220056025

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Abstract

Death of Oscar Hertwig  Oscar Hertwig, biologist, who for many years was director of the Anatomicobiologic Institute of the University of Berlin, died, October 27, at the age of 73. He was a pupil of Gegenbaur, Haeckel and Max Schultze, and became Schultze's assistant in Bonn. In 1875, he established the nature of the impregnation process in the ovum of the sea urchin as a purely morphologic process. This discovery overthrew all the conceptions that had been advanced up to that time, and it remains to this day uncontested. Virchow's dictum "omnis cellula e cellula" was thus extended, and we could say "omnis nucleus e nucleo." Hertwig's second great contribution was his textbook on embryology, published in Jena in 1855, the first to expound clearly, from a strictly chronological standpoint and with a thorough consideration of the developmental phases, the processes of maturation of the ovum, fecundation or impregnation, segmentation,

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