Books Should Be Free is now
Loyal Books
Free Public Domain Audiobooks & eBook Downloads
Search by: Title, Author or Keyword

On Germinal Selection as a Source of Definite Variation   By: (1834-1914)

Book cover

First Page:

BIOLOGICAL PUBLICATIONS.

THE PRIMARY FACTORS OF ORGANIC EVOLUTION. By Prof. E. D. Cope . Cuts, 121. Pp., xvi, 547. Cl., $2.00 (10s.).

DARWIN AND AFTER DARWIN. An Exposition of the Darwinian Theory and a Discussion of Post Darwinian Questions. By George John Romanes, LL. D., F. R. S., etc.

1. THE DARWINIAN THEORY. With portrait of Darwin. Pp., 460. Cuts, 125. Second edition. Cloth, $2.00.

2. POST DARWINIAN QUESTIONS. Heredity and Utility. With portrait of Romanes. Pp., 338. Cloth, $1.50.

3. POST DARWINIAN QUESTIONS. Isolation and Physiological Selection. With portrait of Mr. J. T. Gulick. Pp., 181. 8vo. Cloth, $1.00.

( The three volumes supplied to one order for $4.00. )

A FIRST BOOK IN ORGANIC EVOLUTION. An Introduction to the Study of the Development Theory by D. Kerfoot Shute, M. D. Pages, xvi, 285, 39 illustrations 9 in natural colors. Cloth, $2.00 net (7s. 6d. net).

AN EXAMINATION OF WEISMANNISM. By George John Romanes . Pp., ix, 221. Cloth, $1.00. Paper, 40c.

THE PSYCHIC LIFE OF MICRO ORGANISMS. By Dr. Alfred Binet . Pp., xii, 120. Cloth, 75c (3s. 6d.). Paper, 30c (1s. 6d.).

ON GERMINAL SELECTION. By August Weismann . Pp., xii, 61. Paper, 30c (1s. 6d.).

ON MEMORY, AND THE SPECIFIC ENERGIES OF THE NERVOUS SYSTEM. By E. Hering . Pp., 50. Paper, 20c.

A MECHANICO PHYSIOLOGICAL THEORY OF ORGANIC EVOLUTION. Summary. By Carl von Nägeli . Pp., 52. Paper, 20c (9d.).

ON ORTHOGENESIS. By Th. Eimer . Pp., 56. Paper, 30c. (1s. 6d.).

THE PRINCIPLES OF BACTERIOLOGY. By Dr. Ferdinand Hueppe . Woodcuts, 28. Pp., 467. $1.75 (7s. 6d.).

THE OPEN COURT PUB. CO., CHICAGO.

ON

GERMINAL SELECTION

AS A

SOURCE OF DEFINITE VARIATION

BY

AUGUST WEISMANN

TRANSLATED FROM THE GERMAN BY THOMAS J. McCORMACK

SECOND EDITION

CHICAGO

THE OPEN COURT PUBLISHING COMPANY.

LONDON AGENTS: KEGAN PAUL, TRENCH, TRÜBNER & CO., LTD. 1902.

COPYRIGHT BY THE OPEN COURT PUBLISHING CO. 1896

{3}

PREFACE.

The present paper was read in the first general meeting of the International Congress of Zoölogists at Leyden on September 16, 1895. Several points, which for reasons of brevity were omitted when the paper was read, have been re embodied in the text, and an Appendix has been added where a number of topics receive fuller treatment than could well be accorded to them in a lecture. The address was first printed in The Monist for January, 1896, and afterwards in a German pamphlet.

The basal idea of the essay the existence of Germinal Selection was propounded by me some time since,[1] but it is here for the first time fully set forth and tentatively shown to be the necessary complement of the process of selection. Knowing this factor, we remove, it seems to me, the patent contradiction of the assumption that the general fitness of organisms, or the adaptations necessary to their existence, are produced by accidental variations a contradiction which formed a serious stumbling block to the theory of selection. Though still assuming that the primary variations are "accidental," I yet hope to have demonstrated that an interior mechanism exists which compels them to go on increasing in a definite direction, the moment selection intervenes. Definitely directed {4} variation exists , but not predestined variation, running on independently of the life conditions of the organism, as Naegeli, to mention the most extreme advocate of this doctrine, has assumed; on the contrary, the variation is such as is elicited and controlled by those conditions themselves, though indirectly.

In basing my proof of the doctrine of Germinal Selection on the fundamental conceptions of my theory of heredity, a few words of justification are necessary, owing to the fact that the last mentioned theory has been widely and severely assailed since its first emergence into light and even repudiated as absolutely futile and erroneous... Continue reading book >>




eBook Downloads
ePUB eBook
• iBooks for iPhone and iPad
• Nook
• Sony Reader
Kindle eBook
• Mobi file format for Kindle
Read eBook
• Load eBook in browser
Text File eBook
• Computers
• Windows
• Mac

Review this book



Popular Genres
More Genres
Languages
Paid Books