INDEX 
Cardium, reactions to shadows, 41 
Carr, H., and Watson, J. B., 258 
Casteel, D. B., 231, intelligence of 
Chrysemis, 230 
Cat, imitation, 256 
intelligence, 166, 236-242, 255 
Catfish, intelligence, 222 
Cebus monkey, intelligence, 262, 
264-270 
imitation, 270 
Centipedes, males eating eggs of 
female, 96 
Cerceris, homing, 195 
Cerianthus, geotaxis, 30 
reactions to repeated stimuli, 
144, 145 
Cesaresco, E. M., 258 
Chemotaxis, 21-29, 70, 75, 76, 187 
Chick, imitation, 254 
intelligence, 165, 166, 176-178 
transitory instincts, 99 
Chilomonas, chemotaxis, 27 
Chlamydomonas, geotaxis, 29 
Chromulina, geotaxis, 29 
phototaxis affected by tem- 
perature, 49 
Chrysemis, intelligence, 230 
Chimpanzee, imitation, 272, 273 
intelligence, 262-266, 270, 272, 
273 
Cladophora, 
22 
Claparéde, E., 10, comparative 
psychology, 1, 7 
Claypole, Prof., imitation in young 
ostrich, 254 
Clepsine, phototaxis, 44 
reaction to shadows, 41, 42 
varied behavior, 111, 142 
Cockroaches, geotaxis, 32 
Cole, L. J., 61, phototaxis of pye- 
nogonids, 56 
phototaxis and image forming 
power of eyes, 56, 57 
Oole, L. W., 258, intelligence of 
raccoons, 242-245, 255 
attracting bacteria, 
285 
Communication in ants, 213, 214 
in bees, 215 
Compensatory motions, 39 ff 
in relation to phototaxis, 57 
Condillac, instinct, 92 
intelligence in animals, 232 
Consciousness, criterion of, 3 ff 
Convoluta, tidal rhythms in, 81, 
156 
Cope, E. D., 279, intelligence of a 
Cebus, 266 
Cornetz, V., 216, homing of ants, 
193 
Corymorpha, geotaxis, 31 
Cowles, R. P., learning in Ocypoda, 
184 
Crayfish, compensatory motions, 
40 
devouring their 
young, 95, 96 
instincts as related to reflexes, 
100 ff 
intelligence, 184-186 
reflexes, 13 
Ctenophores, geotaxis, 30 
statocysts, 30, 33 
Cucumaria, geotaxis, 31 
Cunningham, J. T., 138 
Cuvier, F., 279, intelligence of 
orang, 267 
Cypridopsis, phototaxis changed 
by contact, 50 
Cypris, phototaxis changed by 
contact, 50 
eggs and 
Daphnia, movements of eye, 57 
phototaxis changed by com 
tact, 50 
Darwin, C. R., 114, 138, 162, 279 
chimpanzee throwing stones, 
269 
definition of instinct, 91 
evolution of instinct, 115,130 ff 
fear in young ducks, 123 
in young rabbits, 123 
followers of, 1 
