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Königsberg: Bornträger, 1828 und 1837, 4°, Mit 7 (4 kol.; 6 gefalt.) Tafeln und 1 gefalt. Tabelle u. 1 Bl. mit Tabelle ("zu Seite 225") zwischen pp.226 u. 229. XXII, 2, 226 pp., pp.229-271 (so komplett); 2 Bll., 315 pp., 2 Pappbände d.Zt. First Edition - Fine, Contemporary marbled boards with new spine lables! Provenance: Old stamp of Dr. Jules Barrois, Lille on titles and 2 other leaves; minimally stained. *) "Über Entwickelungsgeschichte was never finished--the second volume appeared in incomplete form nine years after the first, in response to the demands of the subscribers; and the conclusion, also incomplete, was not issued until 1888, twelve years after Baer's death and fifty years after it was written" Norman 101 "Von Baer was recognised as the founder of embryology even by his contemporaries. His predecessors, Aristotle, Fabricius, Harvey, Malpighi, Haller, Wolff, had made a beginning with the study of development; von Baer, by the thoroughness of his observation and the strength of his analysis, made embryology a science" Russell, Form and Function, p. 113; chapter IX is a masterly precis of von Baer's work. See also Gould, Ontogeny and Phylogeny, pp. 52-63). "Baer extended Pander's observations on the formation of germ layers., generalizing their meaning to encompass the entire class of vertebrates. He described vertebrate embryonic development from conception to birth, noting the way in which germ layers differentiated themselves by tubulation into various organs, a process more or less common to all vertebrates. He stressed that all embryonic development is epigenetic--proceeding from the apparently homogeneous to the obviously heterogeneous--and emphasized this fundamental embryological principle by pointing out that the embryos of different species resemble one another more closely than do their adult counterparts. Baer's work effectively put an end to the preformation theory of embryonic development, and exerted considerable influence on the contributions of embryologists to evolutionary theory" Norman 101 With his discovery of the mammalian ovum a search ended that had begun over 150 years earlier when Harvey propounded that all animals come from eggs. 'In his more extensive work 'De ovi mammalium et hominis genesi' published in 1827, Baer gathered together with great knowledge and scrupulous care all the known facts of embryology and followed in detail the development of the classical subject of embryological research, the hen's egg. He proceeded from this to study the embryological development of the vertebrates in general and subsequently to propose four basic principles which provided a sound basis for the foundation of a new branch of science' PMM 288b Garrison-Morton No.479; Printing and the Mind of Man 288b (refers to the present 2 volumes); Grolier, One Hundred Books Famous in Science (Horblit) 9a; Le Fanu, Notable Medical Books from the Lilly Library, p.181; Norman 101. Bestandsnummer des Verkäufers 65430
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