Chapter X

, 134 ff.; has a physical basis, 134; due to plasticity, 135; due to pathways through nerve-centres, 136; effects of, 138; practical use of, 138; depends on sensations not attended to, 141; ethical and pedagogical importance of 142 ff.; habit the ultimate cause of association, 256

HAGENAUER, 386

HALL, ROBERT, 223

Hallucinations, 330 ff.

HAMILTON, 260, 268

Harmony, 58

HARTLEY, 255

Hearing, 47 ff.; centre of, in cortex, 113

Heat-sensations, 63 ff.; nerves of, 64

HELMHOLTZ, 26, 42, 43, 55, 56, 58, 121, 226, 227, 231, 233, 234, 321

Hemispheres, general notion of, 97; chief seat of memory, 98; effects of deprivation of, on frogs, 92; on pigeons, 96

HERBART, 222, 326

HERBARTIAN SCHOOL, 157

HERING, 24, 26

HERZEN, 123, 124

HIPPOCAMPI, 88

HODGSON, 262, 264, 280, 283

HOLBROOK, 297

HORSLEY, 107, 118

HUME, 161, 244

Hunger, sensations of, 69

HUXLEY, 143

Hypnotic conditions, 301

Ideas, the theory of, 154 ff.; never come twice the same, 154; they do not permanently exist, 157; abstract ideas, 240, 251; universal 240; order of ideas by association, 253

'Identical retinal points,' 35

Identity, personal, 201; mutations of, 205 ff.; alternating personality, 205

Ideo-motor action the type of all volition, 432

Illusions, 317 ff., 330

Images, mental, compared with sensations, 14; double, in vision, 36; 'after-images,' 43-5; visual, 302; auditory, 306; motor, 307; tactile, 308

Imagination,