6, 347;
and common cognition, 338, 357.

Scott, Sir W., 116, 125.

Secondary qualities, 36, 344.

Selection, process of, in perception, 95;
in dreams, 174;
in memory, 257, 263.

Self, confusion of, in dreams, 163;
introspective knowledge of, 192;
self-deception, 200;
identity of, 241, 282, 285;
confusion of present and past, 267, 284;
disturbances in recognition of, 287, 289;
momentary confusions of, 295;
confusion of present and future, 305.

Self-esteem, illusion of, 315;
origin of, 319;
utility of, 342.

Self-preservation, 320.

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, 5