weismann august 1834 1914 (26 risultati)

hardcover. Condizione: Good. Ex-library book with stickers and/or stamps throughout.

Condizione: New. In.

Condizione: New.

Condizione: New.

Condizione: New.

Condizione: New. In.

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.

gr. in-8°, VI + 70 S., mit 3 Abb. + 1 Farbtafel, Stempel auf Umschlag. Original-Broschüre. Erste deutsche revidierte und erweiterte Ausgabe des anfangs 1909 auf Englisch erschienenen Werkes «Darwin and modern science». Der berühmte deutsche Zoologe, ursprünglich Mediziner, August Weismann, hat seine wichtige ganz neue Erkenntnisse im deutschen Text eingeschaltet. ?Erst während, und besonders nach der Ausarbeitung dieses (zum 100. Geburtstagfeier Darwin's bestimmten englischen) Aufsatzes bin ich darüber anderer Ansicht geworden, . (nämlich) dass man diese (Selektions)theorie doch noch fester begründen könnte, als es bisher geschehen war, dass man die Wirklichkeit von Auslesevorgängen in der Natur nicht blos, wie ich bisher geglaubt hatte, in hohem Grade wahrscheinlich machen, sondern dass man sie beweisen könne? (Vorwort des Verfassers).?Weismann ist der Schöpfer der Keimplasmatheorie. Er lehnte den Lamarckismus ab und wies nach, dass, ?erworbene Eigenschaften? (Veränderungen im Soma) nicht vererbt werden (Neo-Darwinismus)? (Brockhaus).?Weismann, who was the most notable of Neo-Darwinists, claimed that natural selection alone could provide for the formation of varieties and, in time, species, although the Neo-Lamarckians found support in Darwin's own admitted doubts as to the degree to which natural selection alone acted.In defending the Darwinian theory, dealing with apparent difficulties or omissions, Weismann "extended" it and expressed his concepts in new terms. . He has done more than any other man to focus attention on the mechanism of inheritance? (DSB).Please notify before visiting to see a book. Prices are excl. VAT/TVA (only Switzerland) & postage. Dictionary of Scientific Biography XIV/232-239.

hardcover. Condizione: Gut. 353 Seiten; Sprache: Deutsch Gewicht in Gramm: 1.

Hardcover. Condizione: Fair. No Jacket. 1st Edition. 69 pp. Original cloth. A fair copy only, with some splitting to the binding (see photos). 'The Romanes Lecture is the annual public lecture of the University. A most distinguished public figure from the arts, science or literature is invited by special invitation of the Vice-Chancellor. The lecture was created in 1891, following an offer by George John Romanes of Christ Church to fund an annual lecture, and the first lecture was given in 1892 by William Gladstone.' 'The Romanes Lecture for 1894, as now published, is considerably longer than as originally spoken. In reading the Lecture some portions were omitted, which, although essential for the full appreciation of the argument, were not required for understanding its main drift. These passages have been restored to the text; and some notes have been added. I am indebted to Mr. Gregg Wilson for translating the Lecture into English, and to Prof. W. N. Parker for much help in the revision. The manuscript had already gone to press when the news reached me of the sudden death of the Founder of the Lectureship. George Romanes has gone from among us. Though the state of his health for the last few years had made it improbable that a long life would be granted to him, no one thought the end was so near when, on the 2nd of May, he was present at the delivery of this lecture and followed it with a lively interest. His early death is a sad loss to the science for which he had still much to achieve; yet few have better used the time fate has allowed them. He worked with unwearying energy, and a long list of valuable writings bear witness to his line gift of observation, his keen critical intelligence, and his great facility of exposition. In the very last month of his life he had set himself to solve a problem which he had originally, with prophetic insight, put forward a considerable time ago, and which he again followed out with increasing interest when biological enquiry had brought it to the front. Thus his ceaseless energy ended only with his life. Of him it may be saidand nothing higher can be said of any distinguished manhe used to the greatest possible extent the gifts with which Nature had so abundantly supplied him' (Preface). 'Not only did questions about the validity of the inheritance of acquired characters loom as a central topic in biology during the 1890s, but Weismann focused a good deal of his effort on responding to his critics and defending his Keimplasma. As we have seen, a significant amplification to his germ-plasm theory began in 1894 when in the Romanes Lecture he expanded upon his notion of germinal selection' (Frederick Churchill, 'The Germ-Plasm and the Diversity of Living Phenomena: 18901900', Chapter 18, pp. 470-488 in: August Weismann: Development, Heredity, and Evolution, Harvard University Press, 2015).

PAP. Condizione: New. New Book. Delivered from our UK warehouse in 4 to 14 business days. THIS BOOK IS PRINTED ON DEMAND. Established seller since 2000.

1st edition. Both library copies with remaining marks and bookplates. Very good copies in the original gilt-blocked cloth. Spine bands and panel edges somewhat nicked, dulled and rubbed as with age. Remain quite well-preserved overall. Physical description; 2 volumes : illustrations (some color) ; 26 cm. Notes; Includes bibliographical references and index. Translated from the German. Subjects; Evolution (Biology). Evolution Theory. Evolution theory, 20th century. 1 Kg.

1st edition. Both library copies with remaining marks and bookplates. Very good copies in the original gilt-blocked cloth. Spine bands and panel edges somewhat nicked, dulled and rubbed as with age. Remain quite well-preserved overall. Physical description; 2 volumes : illustrations (some color) ; 26 cm. Notes; Includes bibliographical references and index. Translated from the German. Subjects; Evolution (Biology). Evolution Theory. Evolution theory, 20th century. 1 Kg. Item is Shipped from Ireland or US locations.

in-4°, XIV + 342 S.; VIII + 360 S. mit 90 Abb. im Text + 3 farbige Bildtafeln (Schmetterlinge und Raupen), Stempel auf Vorsatz ?Aus der Bibliothek H. Bluntschli angekauft 1955 / + Bibl.-Stempel auf Titel, Halbleinenband. Sehr gutes Ex., beide Bde in 1 Band fest gebunden. Wichtige 3. Ausgabe in 2 Bde, eines der Hauptwerke des deutschen Zoologe, ursprünglich Mediziner, August Weismann.?Weismann ist der Schöpfer der Keimplasmatheorie. Er lehnte den Lamarckismus ab und wies nach, daß, ?erworbene Eigenschaften? (Veränderungen im Soma) nicht vererbt werden (Neo-Darwinismus).? (Brockhaus).Please notify before visiting to see a book. Prices are excl. VAT/TVA (only Switzerland) & postage.

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.

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.

HRD. Condizione: New. New Book. Shipped from UK. THIS BOOK IS PRINTED ON DEMAND. Established seller since 2000.

HRD. Condizione: New. New Book. Delivered from our UK warehouse in 4 to 14 business days. THIS BOOK IS PRINTED ON DEMAND. Established seller since 2000.

Paperback / softback. Condizione: New. This item is printed on demand. New copy - Usually dispatched within 5-9 working days.

Condizione: New. Print on Demand.

Gr.-8°, Hardcover/Pappeinband. Condizione: 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.

Condizione: New. Print on Demand.

Condizione: New. PRINT ON DEMAND.

Hardback. Condizione: New. This item is printed on demand. New copy - Usually dispatched within 5-9 working days.