Freedom in Science and Teaching. from the German of Ernst Haeckel

The Story of Evolution

On the Origin of Species By Means of Natural Selection Or, the Preservation of Favoured Races in the Struggle for Life

The Perpetuation of Living Beings, Hereditary Transmission and Variation Lecture IV. (of VI.), "Lectures to Working Men", at the Museum of Practical Geology, 1863, on Darwin's Work: "Origin of Species"

Vestiges of the Natural History of Creation

Lamarck, the Founder of Evolution: His Life and Work

The Descent of Man and Selection in Relation to Sex, Vol. I

Problems of Genetics

An Examination of Weismannism

Degeneration: A Chapter in Darwinism

Über die Entstehung der Arten im Thier- und Pflanzen-Reich durch natürliche Züchtung

Darwinism stated by Darwin himself Characteristic passages from the writings of Charles Darwin