(For the American market only.)

1. The Darwinian Theory. With portrait of Darwin. Pp., 460. 125 cuts. 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.)

AN EXAMINATION OF WEISMANNISM. By George John Romanes. Pp., ix, 221. Cloth, $1.00. Paper, 35c.

THE PSYCHIC LIFE OF MICRO-ORGANISMS. By Dr. Alfred Binet. Authorised translation. Pp., xii, 120. Cloth, 75c. (3s. 6d.). Paper, 25c. (1s. 6d.).

ON GERMINAL SELECTION. By August Weismann. Pp., xii, 61. Paper, 25c. (1s. 6d.).

ON MEMORY, AND THE SPECIFIC ENERGIES OF THE NERVOUS SYSTEM. By Ewald Hering. 50 pp. Paper, 15c.

A MECHANICO-PHYSIOLOGICAL THEORY OF ORGANIC EVOLUTION. Summary. By Carl von Nägeli. Only original account of Nägeli’s theories in English. Pp., 52. Paper, 15c. (9d.).