On Germinal Selection
As a Source of Definitely Directed Variation. By August Weismann. Translated by Thomas J. McCormack. Pp., xii, 61. Paper, 25c. (1s. 6d.).
“Professor Weismann considers this one of the most important of all his contributions on the evolution problem.... important as marking some fundamental changes in Weismann’s position.”—Science, New York.
“Forms the crown and capsheaf of Weismann’s theory of heredity.”—Exchange.
Butterfly’s Wing from Eimer’s
Orthogenesis.
Illustrating the Definite Character of
Evolution.]
On Orthogenesis (Definite Evolution)
Or the Impotence of Darwinian Selection in the Formation of Species. By Th. Eimer, Professor of Zoology in the University of Tuebingen. Translated by Thomas J. McCormack. 19 cuts. Pp., 56. Paper 25c. (1s. 6d.).
This little brochure was written in reply to Weismann’s “Germinal Selection.” Prof. Eimer argues upon the same lines as the American Neo-Lamarckians, Cope, Hyatt, etc. His doctrine of orthogenesis, which he declares to be a universally valid law, has been framed to show that organisms develop in definite directions, without regard for utility, through purely physiological causes, through the transmission of acquired characters, through the combined agency of the constitution of the animal and the effects of outward influences.
A Mechanico-Physiological Theory of Organic Evolution
Summary. By Carl von Naegeli, Translated by V. A. Clark and F. A. Waugh, of the University of Vermont. The only original account of Naegeli’s theories in English. Pp., 52. Price, paper, 15 cents. (9d.)