Mental Evolution in Man: Origin of Human Faculty

Thoughts on Religion

The Scientific Evidences of Organic Evolution

Mind and Motion and Monism

A Candid Examination of Theism

Darwin, and After Darwin (Vol. 1 and 3, of 3) / An Exposition of the Darwinian Theory and a Discussion of / Post-Darwinian Questions

The Scientific Evidences of Organic Evolution

An Examination of Weismannism

Animal Intelligence

Jelly-Fish, Star-Fish, and Sea-Urchins: Being a Research on Primitive Nervous Systems

The Life and Letters of George John Romanes, M.A., LL.D., F.R.S