Evolution

The Social Behavior of Older Animals

American Snakes

Nature Strange and Beautiful

For Red Hot Blot to Blue Singing Whale

The Modes of Origin of Lowest Organisms

Darwin and Modern Science

The Darwinian Hypothesis

The Charles Darwin Collection

Initiative in Evolution

Pragmatism's Evolution

Disentangling humans

Fires of Life

Animal of realities

At the Deathbed of Darwinism: A Series of Papers

Biology

On the Tendency of Species to Form Varieties

Evolution: An Investigation and a Critique

Pleistocene Pocket Gophers From San Josecito Cave, Nuevo Leon, Mexico

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

Essays Upon Heredity and Kindred Biological Problems