340 
Duckling, inherited co-ordivation 
in, 96 
Dytiscus, instinct of, 104 
E 
Earthworms, Darwin’s observations 
on, 157 ff. 
Edueation in play, 255, 320 ff. 
Effective consciousness detined, 43 
Effereut and afferent impulses, 32, 
101 
Egg, cell-division in, 14 
Eimer, Th., on instincts of solitary 
wasps, 73; on origin of instincts, 
107 
Emotions, and feelings, 235 ff. ; 
psychological nature of, 246; 
evolution of, 282 
Energy stored in cell, 23 
Equilibrium, tendency to, 296 
Eristalis, mimicry of, 164 
Esrinas, Prof, on social life of 
animals, 230 
Ethics, animal, 270 
Evolution 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- 
haviour, 295; as continuous, 324 
ff. 
Experience, of value for future 
guidance, 44; is it inherited? 
48,97; condensation of, 162 
Experimentation, 251, 253 
Explanation, characteristic of later 
phases of mental development, 
58, 257 
Explosive nature of ccll, 21 
Tixpression of emotions, 247 
External stimuli to instinctive be- 
haviour, 102 
F 
Fapre on behaviour of Sphex, 77, 
171; of Chalicodoma, 78, 129; 
of Leucopsis, 79; of Pompilus, 
129 
Faculty, instinctive, 64 
Falcons, training of, 137 
INDEX 
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 Valis- 
neria, 28; of orchids, 29 
Fiyy, Mr. Frank, on the acquisition 
of experience by young birds, 50 
Fission, reproduction of Paramecium 
Flight, instinctive, 86 
Foren 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, 166; germs of, 
332 ff. 
Generic image, 162; situations, 163 
Germinal substance, continuity of, 
328 
GovuLp, Dr., on humming-birds, 273 
Green, Mr. E. G., on ants, 210 
Greentinch, 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 
Have on ants, 199 
Hamerton, P. G., on trained dog, 
152 
Hancock, Dr. Juhn, on cuckoo, 92 
Heredity and circumstance, 39; 
twofold aspect of, 40; relation of 
to use, 170, 176; in evolution as 
continuous, 326 
