1901. Contents: Graeco-Roman Civilization in its Political Development; The Stages of Greek Philosophy; Religious Developments in Later Antiquity; Plotinus and his Nearest Possessions; The Philosophical System of Plotinus; The Mysticism of Plotinus; The Diffusion of Neo-Platonism; The Polemic against Christianity; The Athenian School; and The Influence of Neo-Platonism.