Sensation, element in perception, 20;
    discrimination and classification of, 21;
    interpretation of, 22;
    inattention to, 39, 87;
    modified by central reaction, 39, 87, 89, 91;
    confusion of novel, 40;
    indistinct, 41;
    misinterpretation of, 44;
    relation of, to stimulus, 46, 50;
    limits to discrimination of, 52;
    after-impression, 55;
    subjective, 59, 62, 107, 143;
    localization of, 59.

  Sensibility, limits of, 50;
    variations of, 64.

  Sensualism, philosophic, 348.

  Shadow, cast, 77.

  Shakespeare, 3.

  Sight, mode of perception, 19, 33, 34, 48, 49;
    local discrimination in, 52;
    single vision, 54;
    localization of impression in, 60;
    in sleep, 139;
    images of, in sleep, 150, 154.

  Single, vision, 54;
    touch, 72.

  Sleep, mystery of, 127;
    physiology of, 131.

  Sleight of hand. See Conjuror.

  Smell, as mode of perception, 34, note[14];
    localization of impression in, 60;
    subjective sensations of, 108;
    in sleep, 141;
    and taste, 171.

  Solidity, illusory perception of, 75, 96.

  Space, representation of, 207.

  Specific energy of nerves, 58.

  Spectra, ocular, etc. See Subjective sensation.

  Spencer, Herbert, 32, note[12], 128, note[69], 323, 340.

  Spinoza, 143, 184.

  Spiritualist seances, 103, 107, 123, 265.

  Stereoscope, 75.

  Stewart, Dugald, 172, 306.

  Stimulus, qualitative relation of, to sensations, 46, 58, 67;
    quantitative relation of, to sensation, 50, 64;
    after-effect of, 55;
    prolonged action of, 56;
    subjective or internal, 62;
    exceptional relation of, to organ, 70;
    action of, in sleep, 135, 139, 143;
    in hypnotic condition, 186.

  Struempell, L., 144, 147, note[89].

  Subjective, experience, 26, 27, 137, 214;
    movement, 51, 57;
    sensation, 59, 62, 107, 113, 121, 143.

  Suggestion, by external circumstances, 30, 44, 89, 91, 267;
    verbal, 30, 106, 188, 215, 268, 301, 310.

  Symbol, dream as, 129, 149.

  Sympathy, basis of knowledge, 223;
    and illusion of insight, 223;
    and illusion of memory, 277;
    and momentary illusion, 293.

  T.

  Taine, H., 60, note[29], 108, note[54], 117, note[59], 137,
    298, note[137], 356, note[158].

  Taste, aesthetic. See AEsthetic intuition.

  Taste, localization of impression in, 60;
    subjective sensations of, 63;
    variations in sensibility, 68;
    activity of, in sleep, 141;
    and smell, 171.

  Temperament, a factor in sense-illusion, 101;
    in dreams, 137;
    in illusory belief, 325;
    in illusion generally, 334, note[149].