  - A
- Abstract and general ideas, 57
- Abstraction, 166;
- germs of, 332 ff.
- Acceleration, 250
- Accommodation defined, 36
- Acquired characters, inheritance of, 35, 110
- Acquired instincts (Wundt), 66, 106
- Acquisition defined, 36;
- ultimately dependent on natural selection, 289
- Adaptation defined, 37
- Addison on instinct, 63
- Æsthetics, animal, 270
- Afferent and efferent impulses, 32, 101
- Aid, mutual, among animals, 227
- Ammophila mode of stinging prey, 75;
- of carrying prey, 76;
- deposition of egg, 77;
- intelligent behaviour of, 127
- Amoeba, 296
- Antlers of deer, 15
- Ants, behaviour of, 123;
- intercommunication of, 198;
- social communities of, 205
- Aporus, intelligent behaviour of, 126
- Appreciation, germs of, 273
- Ardour of male in courtship, 269
- Argyromoeba, instincts of, 79
- Arrest of development in egg, 14
- Association in coalescent situation, 46
- Attention, 242
- Audubon on American night-hawks, 261
- Avebury, Lord, on ants, 198;
- on Van, 200;
- on aphides and ants, 214;
- on slave ants, 215;
- on intelligence of ants, 218
- B
- Baldwin, Prof. Mark, on organic selection, 37 (note), 115;
- on functional selection, 163;
- on imitation, 179 ff.;
- on projective stage of development, 275
- Batesian mimicry, 165
- Bechstein on canaries, 262
- Bees, homing of, 131;
- social communities of, 205
- Beetle soliciting food from ant, 213
- Bembex mode of carrying prey, 76
- Bethe, Dr., on instinctive behaviour of ants, 217
- Binet, M., on infusoria, 6
- Biological value of play, 250;
- purpose, 294;
- aspect of animal behaviour, 102
- F
- Fabre on behaviour of Sphex, 77, 172;
- of Chalicodoma, 78, 129;
- of Leucopsis, 79;
- of Pompilus, 129
- Faculty, instinctive, 64
- Falcons, training of, 137
- Fear in birds not inherited in specific direction, 49, 110
- Feelings and emotion, 235 ff.;
- evolution of, 282;
- feeling-tone, 240
- Ferns, fertilization of, 24
- Fertilization of ferns, 24;
- of Valisneria, 28;
- of orchids, 29
- Finn, Mr. Frank, on the acquisition of experience by young birds, 50
- Fission, reproduction of Paramecium by, 4
- Flight, instinctive, 86
- Forel on Componotus, 211
- Foster, Sir Michael, on consciousness accompanying reflex action in pithed frog, 33
- Frog, reflex action in, 33, 299, 300
- Functional selection, 163
- Fungus garden of ants, 216
- G
- Garner, Mr. R. L., “The Speech of Monkeys,” 198
- Gas-engine, analogy of, 20
- General and abstract ideas, 57;
- generalization, 167;
- germs of, 332 ff.
- Generic image, 162;
- situations, 163
- Germinal substance, continuity of, 328
- Gould, Dr., on humming-birds, 273
- Green, Mr. E. G., on ants, 210
- Greenfinch, nest of, 135
- Groos, Prof., on instinct, 64;
- origin of, 116;
- on imitation, 187;
- on animal play, 248 ff.;
- on “Love Play,” 259;
- on coyness of female birds, 264;
- on choice in mating, 267;
- on make-believe, 280
- H
- Habits and habitual acts, 107, 177
- Hague on ants, 199
- Hamerton, P. G., on trained dog, 152
- Hancock, Dr. John, on cuckoo, 92
- Heredity and circumstance, 39;
- twofold aspect of, 40;
- relation of to use, 245, 276
- Octopus, intelligence of, 158
- Œcophylla, behaviour of, 210
- Orchids, fertilization of, 29
- Organic basis of differentiation of consciousness, 53
- Organic behaviour in development, 15
- Organic selection, 37 (note), 115
- Overproduction of movements, 164
- Oxalis, sensitive, behaviour of, 27
- Oxybelus, mode of carrying prey, 76
- P
- Paley, definition of instinct, 64
- Paramecium, behaviour of, 3, 296
- Partridge, note of young, 93
- Peckham, Dr. G. W., on instinct, 65;
- on solitary wasps, 72 ff., 126 ff.
- Pecking instinct of chicks, 93
- Peewit, note of young, 93
- Pelopoeus, instincts of, 72
- Perceptual stage of mental development, 59
- Personality, 245, 257
- Pheasants, note of young, 92;
- inherited co-ordination in, 95;
- plumage of Argus, 262
- Philanthus, prey of, 73;
- mode of stinging prey, 74
- Physiological aspect of animal behaviour, 295
- Pigeons, nests of, 136
- Pigs, wild, behaviour of, 196
- Plants, behaviour of, 24
- Plastic period of life, 168
- Plasticity of tissues, 40;
- of behaviour, 172
- Play of animals, 248 ff.;
- biological value of, 250;
- psychological aspect of, 256, 311, 316
- Playne, Mr. H. C., on pigeons’ nests, 136
- Pleasure, 241;
- ambiguity in word, 285
- Polistes, locality studies of, 131
- Pompilus, mode of carrying prey, 76;
- Fabre’s observation on, 129
- Presentative elements distinguished from re-presentative, 46
- Primary instincts (Romanes), 108
- Projective stage of mental development, 275;
- senses, 304
- Pronuba, instinct of, 82
- Propensity, instincts as, 64;
- congenital, 176
- Protoplasm, fundamental properties of, THE END
PRINTED BY WILLIAM CLOWES AND SONS, LIMITED, LONDON AND BECCLES
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