By E. D. COPE. 121 illustrations. Pp. 550. Tables, bibliography and index. Cloth, net, $2.00. (10s.). A comprehensive handbook of the Neo-Lamarckian theory of Evolution, drawing its main evidence from paleontology, as distinguished from œcology (Darwin) and embryology (Weismann). Discusses the “Energy of Evolution,” and lays special emphasis on the function of consciousness in organic development. “Will stand as the most concise and complete exposition of the doctrines of the Neo-Lamarckian school hitherto published. A most valuable text-book for teachers and students.”--Science, N. Y. “A work of unusual originality. No one can read the book without admiring the intimate knowledge of facts and the great power of generalization which it discloses.”--Prof. J. McK. Cattell. 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. 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. [Illustration: Butterfly’s Wing from Eimer’s ORTHOGENESIS. Illustrating the Definite Character of Evolution.] 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.) Naegeli was the first to propose the general theory of cell-formation accepted to-day. The present little brochure, which is a synopsis of his great work on evolution, will render his difficult theories accessible to English-speaking students, to whom they have hitherto been almost a sealed book. A First Book in Organic Evolution