Space and Geometry in the Light of Physiological, Psychological and Physical Inquiry

By Ernst Mach

Translated by T. J. McCormack. Cloth, gilt top, $1.00 net

The History and the Root of the Principle of the Conservation of Energy

By Ernst Mach

Translated by Philip E. B. Jourdain. Cloth, $1.25 net

On the Inheritance of Acquired Characters

By Eugenio Rignano

Translated by Basil C. H. Harvey. With an appendix "On the Mnemonic Origin and Nature of Affective Tendencies." Cloth, $3.00 net

Darwin and After Darwin