II. Specific forms assumed by the fundamental dualism of Greek thought, 339—Stress laid by Aristotle on the antithesis between Being and not Being, 339—Its formulation in the highest laws of logic, 340—Intermediate character ascribed to accidents, 340—Distinction between truth and real existence, 341—The Categories: their import and derivation, 341—Analysis of the idea of Substance, 343—Analysis of individuality, 345—Substitution of Possibility and Actuality for Matter and Form, 346—Purely verbal significance of this doctrine, 347—Motion as the transformation of Power into Act, 347. III. Aristotle’s theology founded on a dynamical misconception, 348—Necessity of a Prime Mover, 349—Aristotle not a pantheist but a theist, 350—Mistaken interpretation of Sir A. Grant, 351—Inconsistency of Aristotle’s metaphysics with Catholic theology, 352—and with the modern arguments for the existence of a God, 353—as well as with the conclusions of modern science, 353—Self-contradictory character of his system, 354—Motives by which it may be explained, 354—The Greek star-worship and the Christian heaven, 356—Higher position given to the earth by Copernicus, 356—Aristotle’s glorification of the heavens, 357—How his astronomy illustrates the Greek ideas of circumscription and mediation, 358. IV. Aristotle’s general principle of systematisation, 359—Deduction of the Four Elements, 360—Connexion of the Peripatetic physics with astrology and alchemy, 361—Revolution effected by modern science, 361—Systematisation of biology, 362—Aristotle on the Generation of Animals, 363—His success in comparative anatomy, 364. V. Antithetical framework of Aristotle’s psychology, 365—His theory of sensation contrasted with that of the Atomists, 365—His successful treatment of imagination and memory, 366—How general ideas are formed, 366—The active Nous is a self-conscious idea, 367—The train of thought which led to this theory, 368—Meaning of the passage in the _Generation of Animals_, 369—Supposed refutation of materialism, 370—Aristotle not an adherent of Ferrier, 371—Form and matter not distinguished as subject and object, 373—Aristotle rejects the doctrine of personal immortality, 374. VI. Aristotle’s logic, 375—Subordination of judgments to concepts, 376—Science as a process of definition and classification, 377—Aristotle’s theory of propositions, 378—His conceptual analysis of the syllogism, 379—Influence of Aristotle’s metaphysics on his logic, 380—Disjunction the primordial form of all reasoning, 381—How it gives rise to hypothetical and categorical reasoning, 382.