452 ENTOMOLOGY 
Spencer, H. 1866-67. The Principles of Biology. 2 vols. 16-+- 1041 pp., 
306 figs. New York. D. Appleton & Co. 
Wallace, A. R. 1870. Contributions to the Theory of Natural Selection. 
16 + 384 pp. London and New York. Macmillan & Co. 
Weismann, A. 1880-81. Studies in the Theory of Descent. Trans. by 
R. Meldola. 554 pp., 8 pls. London. 
Cope, E. D. 1887. The Origin of the Fittest. 19+ 467 pp., 18 pls., 81 
figs. New York. D. Appleton & Co. 
Henslow, G. 1888. The Origin of Floral Structures through Insect and 
other Agencies. 19-+ 349 pp.; 88 figs. New York. D. Appleton 
& Co. 
Wallace, A. R. 1889. Darwinism. 16+ 404 pp., 37 figs. London and 
New York. Macmillan & Co. 
Eimer, G.H. T. 1890. Organic Evolution as the Result of the Inheritance 
of Acquired Characters according to the Laws of Organic Growth. 
Trans. by J. T. Cunningham. 28+ 435 pp. London and New 
York. Macmillan & Co. 
Weismann, A. 1891, 1892. [Essays upon Heredity and Kindred Biological 
Problems. Ed. by E. B. Poulton, S. Schénland and A. E. Ship- 
ley. Vol. 1, 15+ 471 pp.; vol. 2, 8+226 pp. Ed. 2. Oxford. 
Clarendon Press. 
Romanes, G. J. 1892, 1897, 1901. Darwin and After Darwin. Vol. 1, 
The Darwinian Theory, 14-+ 460 pp., 125 figs.; vol. 2, Heredity 
and Utility, 10 + 344 pp.. 4 figs.; vol. 3, Isolation and Physiological 
Selection, 8-+ 181 pp. Chicago. Open Court Pub. Co. 
Weismann, A. 1892, 1898. The Germ-Plasm. A Theory of Heredity. 
Trans. by W. N. Parker and H. Ronnfeldt. 22-+- 477 pp., 24 figs. 
New York. C. Scribner’s Sons. 
Romanes, G. J. 1893. An Examination of Weismannism. 94+ 221 pp. 
Chicago. Open Court Pub. Co. 
Bateson, W. 1894. Materials for the Study of Variation treated with 
especial Regard to Discontinuity in the Origin of Species. 16+ 
508 pp., 209 figs. London and New York. Macmillan & Co. 
Baldwin, J. M. 1895. Consciousness and Evolution. Science, vol. 2 (n. 
S.), Pp. 219-223. 
Delage, Y. 1895. La structure du protoplasma et les théories sur l’héré- 
dité et les grands problémes de la biologie générale. 16+ 878 pp. 
Paris. C. Reinwald et Cie.* 
Baldwin, J. M. 1896. Physical and Social Heredity. Amer. Nat., vol. 30, 
pp. 422-428. 
Baldwin, J. M. 1896. A New Factor in Evolution. Amer. Nat., vol. 30, 
PP. 441-451, 536-553. 
Baldwin, J. M. 1896. Heredity and Instinct. Science, vol. 3 (n. s.), pp. 
438-441, 558-561. 
Cope, E. D. 1896. The Primary Factors of Organic Evolution. 16-547 
pp., 120 figs. Chicago. Open Court Pub. Co. 
Morgan, C. Lloyd. 1896. On Modification and Variation. Science, vol. 4 
(n. s.), pp. 733-740. 
