The Last Link

The Evolution of Man — Volume 1

The Evolution of Man — Volume 2

The Evolution of Man

Monism as Connecting Religion and Science A Man of Science

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

Les énigmes de l'Univers

The History of Creation, Vol. 1 (of 2) Or the Development of the Earth and its Inhabitants by the Action of Natural Causes

The History of Creation, Vol. 2 (of 2) Or the Development of the Earth and its Inhabitants by the Action of Natural Causes

The Riddle of the Universe at the close of the nineteenth century

Report on the Radiolaria Collected by H.M.S. Challenger During the Years 1873-1876, First Part

Report on the Radiolaria Collected by H.M.S. Challenger During the Years 1873-1876, Second Part

Report on the Radiolaria Collected by H.M.S. Challenger During the Years 1873-1876, Plates Report on the Scientific Results of the Voyage of H.M.S. Challenger During the Years 1873-76, Vol. XVIII