Note 8 — Chapter I · INTRODUCTION
Reading edition
Wake, The Evolution of Morality (1878), vol. ii, p. 4; Westermarck, The Origin and Development of the Moral Ideas (1906), vol. ii, p. 743; T. H. Green, Prolegomena to Ethics, 5th ed., p. 237; George Harris, Moral Evolution (1896), p. 79.