Part 1

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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 Naegeli. 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.

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GERMINAL SELECTION

AS A

SOURCE OF DEFINITE VARIATION

AUGUST WEISMANN

TRANSLATED FROM THE GERMAN BY THOMAS J. McCORMACK

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SECOND EDITION

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CHICAGO

THE OPEN COURT PUBLISHING COMPANY.