342 
Make-believe, 230 
Mammals, early small-brained, 168 
Manipulation (Stout), 251 
Marcuat, Prof., on instincts of 
Cerceris, 74 
Mansaatt, Mr. H. R., on instinct, 
66 
Martin, nest-building of, 112 
Marrineav, James, on pleasure 
and pain, 284 
Mavpas, 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 
Mevtioort, Mr. H. B., on behaviour 
of wild pigs, 196 
Megapodes, instinctive flight of, 
87 
Meloé, instincts of, 81 
Mental development, stages of, 48, 
56 
Mercier, 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 
Mints, Prof. Wesley, on social 
influence on puppy, 220 
Miltogramma, parasitic fly, 134 
Mimicry, Batesian and Miillerian, 
164; intelligent aspect of, 311 
Modifiability, 171 
Modification, defined, 36; relation 
of, to hereditary characters, 
169 
Mo tter, 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 
Miuuer, Prof. Max, on barrier 
between brute and man, 204 
Miillerian mimicry, 164, 165 
Alystery of life, 18 
INDEX 
N 
Natural selection, shielding of 
chicks from, 111; under uniform 
and variable circumstances, 175; 
in playtime of life, 319 
Nervous are, 33; system of higher 
animals, 297 
Nest-building, observations on, 135 
Norns on concept, 166 
Norwegian ponies, 109 
Nucleus division, 1z 
Oo 
Object and subject, 245, 276 
Octopus, intelligence of, 157 
Gicophylla, 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, 163 
Oxalis, sensitive, behaviour of, 27 
Oxybelus, mode of carrying prey, 76 
P 
Patey, definition of instinct, 64 
Paramecium, behaviour of, 3, 296 
Partridge, note of young, 93 
Prcxuam, 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 
behaviour, 295 
Pigeons, nests of, 136 
Pigs, wild, behaviour of, 196 
Plants, behaviour of, 24 
of animal 
