Constantinople an intellectual centre, 372 n. Cosmas map, the 335. Cosmological period of Greek philosophy 12, 13; treated, 15–54. Cosmologist characteristics of the, 18–20; table of, 20; their philosophical question, 20, 21; where they lived, 21; results of their philosophy, 53, 54. Cosmology defined, 13. Crates of Thebes 95. Critical attitude of mind among the Greeks, 61–64; of Socrates, 80. Crusades, the 374, 375. Cusanus, Nicolas 394. Cynic school, the 93–97. Cynics and Stoics 246, 247. Cyrenaic school, the 93–97. Cyrenaics their teaching, and Epicureanism, 229, 230. Dante on Aristotle, 167; used Ptolemaic conception of the universe, 324, 325; diagram of his poetic conception of the universe, 376; his view of the state and the church, 382 n.; placed the intellectual virtues above the practical, 383 n. Dark Ages, the 347–349. Deduction 182. Definition Socrates one of the first to use it correctly, 92. Democritus his place in Greek history, 98–100, 103; and Plato, their similarities and differences, 104–106; life of, 106–108; comprehensiveness of his aim, 108; the enriched physics of, 109–111; the materialistic psychology of, 111–114; his theory of knowledge, 114–116; the ethical theory of, 116–118; a wide traveler, 123; advanced age at which he finished his education, 125. Development according to Aristotle, 178, 179, 185–187. De Wulf _History of Mediæval Philosophy_, 336 n., 384. Dialectic defined, 60, 131. Dill, Samuel _Roman Society_ cited, 274 n. Diogenes 95. Dionysiodorus 68. Dogma _See_ Reason. Dominican tradition Thomas Aquinas the founder of, 380, 381; intellectualism the central principle in, 385. Doxography 6. Drama the Greek, 60, 61. Dualism defined, 51 n.; the Pythagorean, 51, 52; of the Systematic period of Greek philosophy, 102, 103. Dynamic pantheism of Plotinus 293. Eckhart 369, 386. Eclectic Platonists, the 285. Eclecticism 264, 265, 269–272. Efficient cause introduction of conception of, by the Pluralists, 41; defined, 105 n.; Aristotle’s conception of, 187. Elean-Eretrian school, the 93. Eleatic school and Milesian school, Xenophanes the connecting link between, 26; lives of Parmenides and Zeno, 32, 35; teaching of, compared with that of the Milesians and Heracleitus, 22 f.; the philosophy of, 33–37; and Heracleitus, results of the conflict between, 37, 38. Element, the as conceived by the Pluralists, 40, 41. Eleusinian _See_ Mysteries. Emanations the world of, according to Plotinus, 294–297. Emerson, R. W. _Essay on Love_, 153 n.; _Initial, Dæmonic, and Celestial Love_, 153 n.