Evolution

The Kingdom of Man

Life's Dawn on Earth

Evolution: Its nature, its evidence, and its relation to religious thought

The Baculum in the Chipmunks of Western North America

The Factors of Organic Evolution

The Ancestry of Modern Amphibia: A Review of the Evidence

From Atoms to Awareness

Social Learning

Nature's Compass

On the Reception of the 'Origin of Species

The Mechanism of Life

Half Hours With Modern Scientists

Are the Effects of Use and Disuse Inherited

The Social Direction of Evolution: An Outline of the Science of Eugenics

Degeneration: A Chapter in Darwinism

Evolution: An Investigation and a Critique

Evolution

Mr. Gladstone and Genesis

Essays Upon Heredity and Kindred Biological Problems

Essays on Darwinism