The Evolution of Man: A Popular Exposition of the Principal Points of Human Ontogeny and Phylogeny, Volume 2

The History of Creation: Or, The Development of the Earth and Its Inhabitants by the Action of Natural Causes. A Popular Exposition of the Doctrine of Evolution in General, and of that of Darwin, Goethe, and Lamarck in Particular, Volume 1

The History of Creation, Or, The Development of the Earth and Its Inhabitants by the Action of Natural Causes: A Popular Exposition of the Doctrine of Evolution in General, and of that of Darwin, Goethe and Lamarck in Particular, Volume 1

Evolution of Man: A Popular Exposition of the Principal Points of Human Ontogeny & Phylogeny, Volume 1

The Wonders of Life: A Popular Study of Biological Philosophy

The evolution of the species or phylogeny

Eternity; World-war Thoughts on Life and Death, Religion, and the Theory of Evolution

A Visit to Ceylon

Human stem history or phylogeny

The Answer of Ernst Haeckel to the Falsehoods of the Jesuits, Catholic and Protestant: From the German Pamphlet "Sandalion," and "My Church Departure"; Being Haeckel's Reasons, as Stated by Himself, for His Late Withdrawal from the Free Evangelical Church, with Comments by Joseph McCabe and Thaddeus Burr Wakeman

The Evolution of man v. 2: Volume 2

India and Ceylon

The Riddle of the Universe at the Close of the Nineteenth Century

Freedom in Science and Teaching