Evolution

The Intelligent Creation of Life

Curvology

New Perspectives on Horned Dinosaurs

Schenk's Theory: The Determination of Sex

Pioneers of Evolution from Thales to Huxley

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

The genetic and the operative evidence relating to secondary sexual characters

The Effect of External Influences upon Development

A Cultural History of Heredity

The True and False Theory of Evolution

Species and Varieties, Their Origin by Mutation

Biology and Its Makers

A New Human

The Butterfly Hunter

Humanology

The Evolution Controversy in America

Science & Cosmic Messengers

Creatures Born of Mud and Slime

The Genesis of Nature and the Nature of Genesis

The Social Behavior of Older Animals