Evolution

The True and False Theory of Evolution

The Last Link: Our Present Knowledge of the Descent of Man

The Effect of External Influences upon Development

Pioneers of Evolution from Thales to Huxley

Biology and Its Makers

The Butterfly Hunter

Humanology

Science & Cosmic Messengers

Creatures Born of Mud and Slime

The Genesis of Nature and the Nature of Genesis

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

Disentangling humans