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.