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Absolute, 6, 39.

Abstraction, principle of, 42, 124 ff.

Achilles, Zeno's argument of, 173.

Acquaintance, 25, 144.

Activity, 224 ff.

Allman, 161 n.

Analysis, 185, 204, 211, 241.
 * legitimacy of, 150.

Anaximander, 3.

Antinomies, Kant's, 155 ff.

Aquinas, 10.

Aristotle, 40, 160 n., 161 ff., 240.

Arrow, Zeno's argument of, 173.

Assertion, 52.

Atomism, logical, 4.

Atomists, 160.

Belief, 58.
 * primitive and derivative, 69 ff.

Bergson, 4, 11, 13, 20 ff., 137, 138, 150, 158, 165, 174, 178, 229 ff.

Berkeley, 63, 64, 102.

Bolzano, 165.

Boole, 40.

Bradley, 6, 39, 165.

Broad, 172 n.

Brochard, 169 n.

Burnet, 19 n., 160 n., 161 n., 170 n., 171 ff.

Calderon, 95.

Cantor, vi, vii, 155, 165, 190, 194, 199.

Categories, 38.

Causal laws, 109, 212 ff.
 * evidence for, 216 ff.
 * in psychology, 219.

Causation, 34 ff., 79, 212 ff.
 * law of, 221.
 * not a priori, 223, 232.

Cause, 220, 223.

Certainty, degrees of, 67, 68, 212.

Change,
 * demands analysis, 151

Cinematograph, 148, 174.

Classes, 202.
 * non-existence of, 205 ff.

Classical tradition, 3 ff., 58.

Complexity, 145, 157 ff.

Compulsion, 229, 233 ff.

Congruence, 195.

Consecutiveness, 134.

Conservation, 105.

Constituents of facts, 51, 145.

Construction v. inference, iv.

Contemporaries, initial, 119, 120 n.

Continuity, 64, 129 ff., 141 ff., 155 ff.
 * of change, 106, 108, 130 ff.

Correlation of mental and physical, 233.

Counting, 164, 181, 187 ff., 203.

Couturat, 40 n.

Dante, 10.

Darwin, 4, 11, 23, 30.

Data, 65 ff., 211.
 * "hard" and "soft," 70 ff.

Dates, 117.

Definition, 204.

Descartes, 5, 73, 238.

Descriptions, 201, 214.

Desire, 227, 235.

Determinism, 233.

Doubt, 237.

Dreams, 85, 93.

Duration, 146, 149.

Earlier and later, 116.

Effect, 220.

Eleatics, 19.

Empiricism, 37, 222.

Enclosure, 114 ff., 120.

Enumeration, 202.

Euclid, 160, 164. Rh