46].

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