INDEX 
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 
Esthetics, animal, 270 
Afferent and efferent impulses, 32, 
101 
Aid, mutual, among animals, 227 
Ammophila mode of stinging prey, 
75; of carrying prey, 76 ; deposi- 
tion of egg, 77; intelligent be- 
haviour of, 127 
Ameba, 296 
Antlers of deer, 15 
Ants, behaviour of, 123; 
communication of, 198; 
communities of, 205 
Aporus, intelligent behaviour of, 
126 
inter- 
social 
Appreciation, germs of, 273 
Ardour of male in courtship, 269 
Argyromeba, instincts of, 79 
Arrest of development in egg, 14 
Association in coalescent situation, 
46 
Attention, 242 
AvUDUBON on American night-hawks, 
261 
Avesury, Lord, on ants, 198; on 
Van, 200; on aphides and ants, 
214; on slave ants, 215; on 
intelligence of ants, 218 
B 
Batpwiy, 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 
BECKSTEIN on canaries, 262 
Bees, homing of, 131; social com- 
munities of, 205 
Beetle soliciting food from ant, 213 
Bembex mode of carrying prey, 76 
BeEtueE, Dr.,on instinctive behaviour 
of ants, 217 
BrneEt, M., on infusoria, 6 
Biological value of play, 250; pur- 
pose, 294; aspect of animal be- 
haviour, 305 : 
Birch-weevil, leafcase of, 121 
Birds, instinct of, 84 
Bison, behaviour of the, 226 
Buacksurn, Mrs. Hugh, on instinet 
of cuckoo, 90 
BiockMAnn, Dr., on componotus, 
210 
Bo.ton on goldfinches’ nests, 136 
Bower-bird, observations on, 261, 
273 
Buckman, Mr. S. S., on speech of 
children, 203 
Bupeetr, Mr. John &, on nest- 
building, 135 
Bullfinch, nest of, 135 
338 
