Illusion, 107;
and legend, 137;
Conscious, of mystic, 228.

Illusions, valuable to scientist, 251.

Image, Modification of, 18, 291.

Images, 80;
abbreviations of reality, 232;
Categories of, 16;
Concrete, 222;
provoked, 188;
sketched type, 81;
Symbolic, 222;
Visual, provoked by music, 217.

Imagination, and abulia, 11;
and foresight, 284;
anthropocentric, 10;
basis of the cosmic process, 75;
Commercial, 281;
complete in animals, 95;
condensed in common objects, 276;
Conditions of, 44;
Development of, 167 ff.;
Diffluent, 196 ff.;
Esthetic, 264;
fixed form, 318;
in animals, 93;
in experimentation, 248;
in primitive man, 118;
Mechanical and technical, 257;
Motives of different sorts of, 251;
Musical, 212 ff., 350;
Mystic, 221 ff.;
Mystical, different from religious, 231;
not opposed to the useful, 263;
Numerical, 207 ff.;
Periods of development of, 144;
Plastic, 184 ff.;
Poetical, 267;
Practical, 256 ff.;
present in all activities, viii;
Quality of, same in many lives, 265;
Scientific, 236 ff.;
sketched form, 316;
substitute for reason, 29;
Varieties of, 180.

Imaginative type, 320.

Imitation, through pleasure, 98.

Imitative music, 214.

Impersonality, 52, 86.

Incomplete images, 18.

Incubation, Periods of, 278.

Individual variations, 179.

Individuality of genius, 149.

Inductive reasoning, 132.

Infantile insanity, 101.

Inhibition by representation, 6.

Initial moment of discovery, 276.

Inspiration, 50, 85;
and intoxication, 55;
Characteristic of, 57;
characterized by suddenness and impersonality, 51;
resembles somnambulism, 56;
Subjective feeling of, untrustworthy, 59.

Instinct, 75;
answer to specific needs, 42;
Creative, 313;
Resemblance of invention to, 48.

Intellectual factor, 15.

Intuition, 282, 285.

Introspectors, 321.

Intentional combination of images, 95.

Interest, a factor in creation, 82.

Interesting, defined, 36.

Invention arises to satisfy a need, 271;
Higher forms of, 140 ff.;
in morals, 300;
in successive parts, 296;
of monopolies, 282;
Pain of, 51;
Spontaneity of, 51;
subjected to tradition, 269.

Inventions, Amplifiers of, 270;
largely anonymous, 275;
Mechanical, neglected by psychologists, 263;
Stratification of, 272.

Inventors deified, 269;
Oddities of, 72.

James, William, 21, 25, 37, 83, 11