Weismann august 1834 1914 (10 Ergebnisse)

Zustand: New. In English.

Zustand: New. In English.

8vo. 49, [1] pp. Occasional light pencil marginalia. Original printed wrappers; top cover soiled and with pencil notations. Very good. SECOND EDITION. "August Friedrich Leopold Weismann studied how the traits of organisms developed and evolved in a variety of organisms, mostly insects and aquatic animals, in Germany in the late nineteenth and early twentieth centuries. Weismann proposed the theory of the continuity of germ-plasm, a theory of heredity. Weismann postulated that germ-plasm was the hereditary material in cells, and parents transmitted to their offspring only the germ-plasm present in germ-cells (sperm and egg cells) rather than somatic or body cells. Weismann also promoted Charles Darwin's 1859 theory of the evolution of species. Weismann argued that only changes to the germ cells, and not body cells, could be inherited, a theory that influenced theories of heredity throughout later centuries". / "In 1884, Weismann quit microscopic study again due to the deterioration of his eyesight and instead focused on theoretical questions in biology. The following year, Weismann published an essay titled "Die Continuitat des Keimplasmas als Grundlage einer Theorie der Vererbung" ("The Continuity of the Germ-plasm as the Foundation of a Theory of Heredity") . . . Inspired by his work on the generation of sex cells and parthenogenesis, Weismann hypothesized that the germ-plasm, which he now argued was a substance in the nucleus of a germ cell, had a highly complex structure". â" Yawen Zou, August Friedrich Leopold Weismann (1834-1914), Arizona State University, Embryo Project Encyclopedia. / August Weismann became professor of zoology at the University of Freiburg in 1874. He was the founding director of the Zoological Institute at the University of Freiburg, starting in 1867. DSB, XIV, pp. 232-239.…

hardcover. Zustand: Gut. 353 Seiten; Sprache: Deutsch Gewicht in Gramm: 980.

8° , Softcover/Paperback. 1.Auflage.. VIII, 128 Seiten Einband etwas berieben, Bibl.Ex., Rücken mit Einrissen, innen guter und sauberer Zustand Sprache: Deutsch Gewicht in Gramm: 450.

Large 8vo, 25.5cm. Pp. iv,91,[3], 22 figs. of butterflies on 2 chrolithographed plates. Paperbound, orig. printed wrappers, uncut. Occasional faint foxing, some light age wear to covers, spine neatly strengthened with matching old paper, one corner a little bumped, good otherwise. - Inscribed on front cover by author: "Herrn Dr. Fr. Thomas hochachtungsvollst d. Verfr. - Weismann believed that transmutation of species is directly due to the influence of environment. This is close to the modern use of the concept that changes in the environment can mediate selective pressures on a population, so leading to evolutionary change.…

Large 8vo, 23cm. Pp. xviii,628,[2], 24 figures in text, index. Original half morocco, marbled boards, gilt-lettered title within decorative border to backstrip. Fine. - [phd.245].

Two volumes. 238 x 165 mm. 8vo. xii, 456; vi, 462 pp. 131 figs. (1 color), index, 3 color plates. Modern green buckram, gilt spine titles. Ownership signature of M. J. Fell. Fine set. First Edition of Weismann's lectures on germ-plasm, delivered at the University of Freiburg. Weismann begins with an historical introduction citing the works of Goethe, Erasmus Darwin, Treviranus, Lamarck, Oken, and Charles Darwin. Barchas Collection 2126; BM (Nat. Hist). VIII, p. 14010; Gascoigne 13901.12a; Hughes, A History of Cytology, pp. 80-83.…

Hardcover. 2 Volumes. 8vo. pp. 1 p.l., [v]-xxxvi, 400; 1 p.l., [401]-729, [1]errata. lacking half-titles. 8 chromolithographed plates. original black-stamped & gilt-lettered cloth (extremities & joints bit rubbed & frayed, 1 gathering sprung, errata crossed out & all corrections entered in ms. by former owner). small book label on title of F.J.Cole. First Edition of the English Translation by Raphael Meldola, with preface by Charles Darwin & a new Engish preface by Weismann (first published in German at Leipzig in 1875-76). [The German zoologist's] most influential contribution to biological thought was his theory of the continuity of the germ plasm, an explanation of heredity and development. He maintained that the germ plasm, the substance of heredity, was transmitted from generation to generation, distinguishing it from the somatoplasm; he also was foremost in his day in denying that acquired characters were inherited. Keeping abreast of current researches on the cell and the growing understanding of the role of the nucleus and the chromosomes in inheritance, Weismann modified the theory of germinal continuity. Cytology repeatedly confirmed the phenomena the existence of which he had presumed with theoretical considerations. He was a strong defender of Darwin's theory of evolution and a leader among Neo-Darwinists arguing for the sufficiency of natural selection.[In the present work he] treated the seasonal dimorphism of butterflies and questions of evolution and heredity.[and] proceeded to construct his own theory of heredity rather than accept Darwin's hypothesis of pangenesis.he decided that acquired characters could not be inherited, for to become inheritable, changes would have to affect the germ plasm itself.". (DSB) Freeman 3932.…

Gr.-8°, Hardcover/Pappeinband. Zustand: Gut. 94 Seiten plus farbiger Tafelteil Rares Werk mit marmoriertem Einband. Nachgedunkelte Seiten mit Bibliotheksstempelung auf der Titelseit. Mir farbigem Tafelteil. Sprache: Deutsch Gewicht in Gramm: 383.