Anaxagoras his life, 43; his philosophy, 45–47. Anaximander 24, 25. Anaximenes 25. Ancient Philosophy length of, 1; underlying character of, 2; divisions of, 4, 5; literary sources of, 6. Animism 19. Anselm life and position in mediæval philosophy, 359–361; his arguments for the existence of God, 361; on reason and dogma, 365. Anthropological period of Greek philosophy 12, 13; discussion of, 55–97; historical summary of, 55. Anthropologists 103. Anthropology defined, 13. Antiochus of Ascalon 270, 271. Antisthenes founder of the Cynic school, 93, 95. Apathy Stoic, 251. Apollonius neo-Pythagorean, 285. Apologists, the 307–309. Aquinas, Thomas on the problem of reason and faith, 369, 377; the predecessors of, 379, 380; life of (founder of the Dominican tradition), 380, 381; the central principle of his doctrine, 381–383; the problem of individuality according to, 383–385; on the will and the intellect, 385, 386. Arabian schools, 371, 372; translations of Greek works, 372, 373. Arcesilaus 267. ἀρετή meaning of, 84. Aristippus founder of the Cyrenaic school, 93, 96; and Epicurus, 229, 230. Aristophanes opposed the Sophists, 74. Aristotle his place in Greek history, 98–100, 103; conceptualist, 104; advanced age at which he finished his education, 125; in the Academy and Lyceum, 166–168; chronological sketch of his life, 168, 169; his biography in detail, 169–173; the writings of, 173–176; his starting-point, 176, 177; the fundamental principle in his philosophy, 177–180; his logic, 180–185; his metaphysics, 185–194; development is purposeful, 185–187; his two different conceptions of purpose, 187–190; his conception of God, 190, 191; his conception of matter, 191, 192; his conception of nature, 192–194; his theory of physics, 194–196; his psychology, 196–199; his ethics, 199–202; his political philosophy, 202, 203; in the Middle Ages, 332, 363, 368, 369; Arabic versions of his works, 372, 373; works of, introduced into Western Europe, 375–378; the strength and burden of, to the church, 378, 379; and Thomas Aquinas, 380, 381. Arnold, Matthew 43 n. Astronomy of the Pythagoreans, 49–52, 53; Ptolemaic, 322–325. _Ataraxia_ of Epicurus, 231, 233; of the Skeptics, 266. Athenian school of neo-Platonism 290, 299–301. Athens rise of, 57, 58; and Socrates, 91; and Abdera, 119; a centre of Hellenism, 213–215. Atomism of Epicurus, the 238–240. Atomistic school, the 107. Atomists, the philosophy of, 47, 48. Atoms of Democritus, the 109–114, 116, 117.