1908. Lewis writes in the Preface: The contents of this volume consist of the first ten lectures of the thirty-five in the Winter course of 1907-08. They were delivered in the Garrick Theater, Chicago, on Sunday mornings to crowded houses. On several occasions half as many people were turned away as managed to get in. If these lectures meet with as warm a reception when read as they did when heard, I shall be more than satisfied. For a fuller discussion of the Greek period, briefly dealt with in the first lecture, see Edward Clodd's Pioneers of Evolution to which work the early part of this lecture is greatly indebted. Every lecture proceeds on the assumption, that a knowledge of the natural sciences, and especially the great revolutionizing generalizations which they have revealed, is indispensable. Contents: Thales to Linnaeus; Linnaeus to Lamarck; Darwin's Natural Selection; Weismann's Theory of Heredity; De Vries' Mutation; Kropotkin's Mutual Aid; A Reply to Haeckel; Spencer's Social Organism; Spencer's Individualism; and Civilization-Ward and Dietzgen. See other titles by this author available from Kessinger Publishing.