286 
Darwin, C. R., imperfect instincts 
of Molothrus, 96 
intelligence of earthworms, 161 
Lamarckian theory of instinct 
inadequate, 126 
mental evolution, 260 
reactions of earthworms, 28, 
140 
Davenport, C. B., 61 
Davis, H. B., 258, intelligence of 
raccoons, 243, 255 
Day, L. M. and Bentley, M., 
learning in Paramcecium, 
87-89 
Death-feigning. See FeigningDeath. 
Delage, Y., equilibrium in crus- 
tacea, 31 
Delbeeuf, J., 231, intelligence ni 
lizards, 229 
Dellinger, O. P., 89, locomotion in 
Amoeba, 66 
Descartes, R., consciousness in 
animals, 4 
Didinium, capture of food, 64, 
77-79 
Dog, imitation in, 256 
instinct to swim, 97 _ 
intelligence, 235-237, 240, 245, 
246, 249-251, 255 
Dragon fly, larval and adult 
instincts compared, 98 
Driesch, H., geotaxis in Sertulari- 
ella, 30 
Drzewina, A., 189, tidal rhythms 
in phototaxis of hermit 
crabs, 158 
learning in Pachygrapsus, 187 
Earthworms, phototaxis, 21, 43, 
44, 54 
intelligence, 161 
interference of reactions, 140 
reactions to chemicals, 28 
varied reactions, 148, 149 
Earwigs, thigmotaxis, 36 
Edinger, L., 231 
INDEX 
Eimer, O. E., 38, definition of 
instinct, 92 
origin of instinct, 118, 119 
Electrotaxis, 59 ff 
Eledone, intelligence, 189 
Emery, C., 216 
Englemann, T. W., chemotaxis of 
bacteria, 22 
influence of oxygen on photo- 
taxis, 49 
Epeira, instincts of young, 98 
Escherich, K., 216 
Eubranchipus, photataxis, 54 
Eudendrium planulz, phototaxis,52 
Euglena, geotaxis, 29 
phototaxis, 28, 44, 45 
Fabre, J. H., 216, constancy of 
instinct, 132 
intelligence of beetles, 206 
locality sense of mason bee, 197 
nature of instinct, 91 
Fatigue as cause of change of 
behavior, 84, 142-145, 149 
Fear of hawks, not innate, 123 
in fiddler crabs, 140 
in Rhea, 122, 123 
in sparrows, 122 
in young birds in general, 96, 
121-123 
in young ducks, 123 
in young rabbits, 123 
in young terns, 96, 97 
Feigning death, change of attitude 
in through fatigue, 143 
in young terns, 96,97 
Fiddler crabs, interference of reac- 
tions, 140 
phototaxis, 48, 56, 140, 144 
Fishes, intelligence, 219 ff 
rheotaxis, 37, 38, 57 
Fleure, H. J., and Walton, C. L., 
162, reactions of Actinia, 
159, 160 
Fly, behavior of decapitated speci- 
mens, 104 
