340 
INDEX 
Duckling, inherited co-ordination | Fear in birds not inherited in 
in, 96 
Dytiscus, instinct of, 104 
E 
Earthworms, Darwin’s observations 
on, 158 ff. 
Education in play, 255, 320 ff. 
Effective consciousness defined, 43 
Efferent and afferent impulses, 32, 
101 
Egg, cell-division in, 14 
Ermer, Th., on instincts of solitary 
wasps, 73; on origin of instincts, 
108 
Emotions, and feelings, 235 ff.; 
psychological nature of, 246; 
evolution of, 282 
Energy stored in cell, 23 
Equilibrium, tendency to, 296 
Hristalis, mimicry of, 164 
Espinas, Prof., on social life of 
animals, 230 
Ethics, animal, 270 
Eyolution of organic behaviour, 35; 
of consciousness, 61; of instinc- 
tive behaviour, 106; of intelligent 
behaviour, 155; of social be- 
haviour, 225; of feeling and 
emotion, 282; of animal be- 
hayiour, 295; as continuous, 324 
Experience, of value for future 
guidance, 44; is it inherited? 
48,97 ; condensation of, 163 
Experimentation, 251, 253 
Explanation, characteristic of later 
phases of mental development, 
58, 257 
Explosive nature of cell, 21 
Expression of emotions, 247 
External stimuli to instinctive be- 
haviour, 102 
F 
Fasre on behaviour of Sphex, 77, 
172; of Chalicodoma, 78, 129; 
of Leucopsis, 79; of Pompilus, 
129 
Faculty, instinctive, 64 
Falcons, training of, 137 
specific direction, 49, 110 
Feelings and emotion, 235 ff.; 
evolution of, 282; feeling-tone, 
240 
Ferns, fertilization of, 24 
Fertilization of ferns, 24; of Valis- 
neria, 28; of orchids, 29 
Fy, Mr. Frank, on the acquisition 
of experience by young birds, 50 
Fission, reproduction of Paramecium 
by, 4 
Flight, instinctive, 86 
Foret on Componotus, 211 
Foster, Sir Michael, on conscious- 
ness 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 
GouLp, 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 
HaGueE 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 ot 
to use, 170, 177; in evolution as 
continuous, 326 
