Dreams, relation of, to illusions of sense, 18, 130; and waking experience, 127; theories of, 128; physiology of, 131; extent of, in sleep, 132; psychological conditions of, 136; excitants of, 139, 143; exaggeration in, 147; symbolism of, 149; as results of automatic activity of centres, 151; as results of association, 153; structure of, 156; incoherent, 156; coherent, 161; action of feeling in, 164; play of associative dispositions in, 168; co-operation of attention and intelligence in, 172; limits of intelligence in, 180; after-dreams, 183, 274; relation of, to hypnotic condition, 185; experience of, in relation to errors of memory, 273. E. Eccentricity, law of, 59. Ego. _See_ Self. Emotion, and illusion of perception, 103; and hallucination, 115; and bodily sensations, 150; control of dreams by, 164; introspection of, 199; and illusion of introspection, 203; and aesthetic intuition, 213; and illusion of memory, 270; and illusion of belief, 306, 324; and cognition generally, 357, note[159]. Empiricism, philosophic, 348. _Ennui_, and sense of time, 250. Environment, sources of sense-illusion in, 47, 48, 70; view of, in mental disease, 290, 326; view of, in normal life, 323; action of, in assimilating belief, 339. Error, immediate and mediate, 6, 334. Esquirol, J.E.D., 12, note[2]. Evolution, relation of, to dissolution, 122; of power of introspection, 209; of power of insight, 230; and self-assertion, 320; evolutionist's view of error, 339; doctrine of, as science, 346. Exaggeration, in interpretation of sensations, 65; in dream-interpretation, 147; in memory, 269. Expectation, preliminary to perception, 30; and illusory perception, 93, 102, 106; nature of, 295; and memory, 298; of new experience, 301; of remote events, 302; measurement of duration in, 302; action of imagination in, 305; extension of meaning of, 307, 308. Experience, effect of, in perception, 22, 68, 85, 86, 91; external and internal, 194, 210; revivals of waking, in dreams, 152; effects of present, on retrospection, 267; anticipation of new, 301. External world. _See_ World. F. Fallacy and illusion 6, 335; of testimony, 265. Familiarity, sense of, in new objects, 272, 281. Fechner, G.T., 51. Ferrier, Dr., 32, note[12], 58, note[26]. Fiction, as producing illusion, 278, 279, 311. Fitness. _See_ Adaptation. Flattery, _rationale_ of, 200, 222. Forgetfulness and illusion, 278, 279, 311. Free-will, doctrine of, 207, 342, 356. Future. _See_ Expectation. G. Galton, F., 117. Ghosts. _See_ Hallucination. Goethe, 116, 117, 280 and note[131]. Griesinger, W., 13, note[2], 63, note[31], 66, note[32], 115, 118, note[62], 119, note[64], 120, note[66], 290, note[135], 327, note[146].