Gruithuisen, 143, 144.

  Gurney, E., 224, note[109].

  H.

  Hall, G.S., 186, note[102].

  Hallucination, and illusion, 11, 109, 111, 112, 121;
    and subjective sensation, 63, 109, 121;
    sensory and motor, 66;
    nervous conditions of, 112-114;
    incomplete and complete, 113;
    as having either central or peripheral origin, 113;
    causes of, classified, 115;
    in sane condition, 116;
    in insanity, 118;
    visual and auditory, 119;
    dreams regarded as, 139, 151;
    hypnagogic, 143;
    after-dreams and ghosts, 183;
    of memory, 271;
    relation of, to errors of belief, 322;
    intuition of external world regarded as, 355.

  Happiness, feeling of, 200.

  Harmful, illusion as, 188, 229, 292, 339.

  Harmless, illusions as, 124, 292, 341.

  Hartley, D., 139, 256, note[124], 279.

  Hearing, as mode of perception, 34, 48;
    localization of impression in, 60;
    sense of direction in, 72;
    activity of, in sleep, 140;
    and muscular sense, 171.

  Heidenhain, Dr., 186-188.

  Helmholtz, H., 22, 23, note[7], 44, 51, 54 and note[22], 55, note[23],
    57, 67, note[33], 78, note[39], 80, 85, note[43], 88, 90, 207,
    note[105].

  Heraclitus, 137.

  Heredity, and illusion of memory, 280;
    action of, in perpetuating intuition, 359.

  Hering, E., 67, note[33].

  Hodgson, Shadworth H., 347, note[153].

  Holland, Sir H., 277.

  Hood, Thomas, 146.

  Hope, illusory. See Expectation.

  Hoppe, Dr. J.I., 51, 58, note[26].

  Horwicz, A., 145, note[85].

  Hume, D., 355.

  Huxley, Professor T., 119, note[1].

  Hyperaesthesia, 65.

  Hypnotism, 185.

  Hypochondria, 65.

  Hypothesis, as illusory, 310, 311.

  I.

  Idealism, 348.

  Identity, cases of mistaken, 267.

  Identity, personal, confusion of, in dreams, 163;
    consciousness of, 241, 267, 282, 285;
    illusory forms of, 283;
    gross disturbances of, in normal life, 287;
    in abnormal life, 289;
    momentary confusions of, 293.

  Illusion, definition of, 1;
    varieties of, 9;
    extent of, 328;
    rationale of, 331, 337.

  Image (physical). See Reflection.

  Image (mental), in perception, 22;
    seat of, 32;
    in dreams, 138;
    mnemonic, 236.

  Imagination, play of, in perception, 95, 99;
    and sense-illusion, 106;
    nature of, in dreaming, 136, 161;
    as antecedent of dream, 152, 158;
    as poetic interpretation of nature, 224;
    memory corrupted by effect of past, 264, 273, 277;
    present, creating the semblance of recollection, 267, 271;
    play of, in expectation, 305;
    as element of illusion generally, 333.