First published in 1911. The first chapter in this fascinating study devotes itself to a short preliminary introduction to Darwin’s ideas, and some remarks on the thoughts of the ancients on the subject and how matters stood in the period immediately preceding the appearance of Darwin himself. The second and third chapters discuss Darwin’s theory and a suggested alternative hypothesis. The concluding chapter is devoted to the philosophical aspect of the case, and to some general reflections after a close perusal of Darwin’s works.