342 
Make-believe, 280 
Mammals, early small-brained, 168 
Manipulation (Stout), 251 
MarcaaL, Prof., on instincts of 
Cerceris, 74 
MarsHat, Mr. H. R., on instinct, 
6 
Martin, nest-building of, 113 
MarrineEav, James, on pleasure 
and pain, 284 
Maupas, M., observations on, in- 
fusoria, 4 
Mayer, Dr. A. G., on mating, 
instinct of moths, 83 
McCook, Dr., on ants, 214 
Meaning, Dr. Stout’s use of term, - 
46, 243, 268 
Mepticort, Mr. H. B., on behaviour 
of wild pigs. 196 
Megapodes, instinctive flight of, 
87 
Meloé, instincts of, 81 
Mental development, stages of, 48, 
56 
Mercter, Dr. Charles, on criteria of 
intelligence, 120 
Metaphysical explanations, 19; 
aspect of instinct, 64; of impulse, 
237; of purpose, 294; of will, 307; 
of life, 325 
Mitts, Prof. Wesley, on social 
influence on puppy, 220 
Miltogramma, parasitic fly, 134 
Mimicry, Batesian and Miillerian, 
165; intelligent aspect of, 311 
Modifiability, 171 
Modification, defined, 36; relation 
of, to hereditary characters, 
170 
Mo.ter, Herr, on fungus garden of 
ants, 216 
Monistic hypothesis, 309, 315 
Monkey, capuchin, imitation in, 
188 
Monodontomerus, instincts of, 79 
Moor-hen, diving of, 89 
Moths mating, instinct of, 83 
Motive in rational conduct, 60 
Movement plays, 251 
Miiuer, Prof. Max, on _ barrier 
between brute and man, 204 
Miillerian mimicry, 165, 166 
Mystery of life, 18 
INDEX 
N 
Natural selection, shielding of 
chicks from, 111; under uniform 
and yariable circumstances, 175; 
in playtime of life, 319 
Nervous are, 33; system of higher 
animals, 297 
Nest-building, observations on, 135 
NorreE on concept, 167 
Norwegian ponies, 109 
Nucleus division, 12 
O 
Object and subject, 245, 276 
Octopus, intelligence of, 158 
Cicophylla, 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 
E 
PALey, definition of instinct, 64 
Paramecium, behaviour of, 3, 296 
Partridge, note of young, 93 
PrckHAM, Dr. G. W., on instinct, 
65; on solitary wasps, 72 ff, 
126 ff. 
Pecking instinct of chicks, 93 
Peewit, note of young, 93 
Pelopzus, instincts of, 72 
Perceptual stage of mental develop- 
ment, 59 
Personality, 245, 257 
Pheasants, note of young, 92; in- 
herited 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 
