Origin of Species

Evolution of Theology: an Anthropological Study

Discourses / Biological and Geological Essays

Science & Education

On the Study of Zoology

Evolution and Ethics

Aphorisms and Reflections from the works of T. H. Huxley

On the Advisableness of Improving Natural Knowledge

The Advance of Science in the Last Half-Century

The Interpreters of Genesis and the Interpreters of Nature

American Addresses, with a Lecture on the Study of Biology