Essays Upon Heredity and kindred Biological Problems. Edited by Edward B. Poulton, Selmar Schonland and Arthur E. Shipley. Authorised translation. Second edition.

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2 volumes. Small 8vo. xv, [1], 471, [1], 8; v, [3], 226, [2], 72 pp. Figures, indexes; some pencil notes at rear (extensive in vol. I) â " and likely written by Leonard D. White, Jr. Original blind- and gilt-stamped navy cloth; some minor wear to extremities. Ownership signature of Leonard D. White, Jr., Feb. 12, 1894. Frederick A. Frye bookplate. Very good. Contains the first English translation of Weismannâ s paper "Amphixis or the essential meaning of conjugation and sexual reproduction." (See Volume U, pp. 99-222). Weismann described 'amphiximisâ as "the union of the two parent germs, which he considered the principle source of heritable variation in evolution by natural selection." â " Garrison and Morton 234. / "From 1881 onwards, Weismann published a series of essays about heredity. Those essays were collated in English in 1889â s Essays upon Heredity and Kindred Biological Problems. The essays discussed topics including senescence, acquired characteristics, and the germ-plasm theory. For example, in the first chapter, "The Duration of Life," a translation of an essay originally published in German in 1881, Weismann detailed his evolutionary theory of senescence, the name given to the gradual deterioration of function of most life forms after they mature to adults. Weismann argued against theories that associated the length of an organismâ s life with the size or complexity of its body, or with how active it appears to be. Instead, he appealed to natural selection, arguing that it adapted organisms to reach reproductive maturity, and that it would not select for the capacity of the organism to live any longer once it was past reproductive age. He further argued that the death of male bees after they reproduced was selected for by nature to save nutrition for the colony, a phenomenon that precluded those organisms that had already reproduced from consuming resources." â " Yawen Zou, Embryo Project Encyclopedia, Arizona State University. / German biologist August Friedrich Leopold Weismann taught zoology at the University of Freiburg (1886-1912) and became the originator of the germ plasm theory of heredity. PROVENANCE: [1] Leonard D. White, M.D. (1856-1906) was a late 19th-century physician and one of the Health Officers in Massachusetts who was involved with the earliest study of mosquitoes and malaria and efforts for community prevention of malaria. [2] Frederick A. Frye, M.D. (1934-2021), San Diego. REFERENCES: Garrison and Morton 234 (citing the 1891 first German edition). N° de ref. del artículo M15001

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