INDEX 
Abbott, C. C., intelligence of frogs, 
228 
Actinians, effect of hunger on, 150, 
151 
geotaxis, 222 
tidal and daily rhythms, 157 
varied reactions, 144-147, 159— 
161 
Adams, G. P., phototaxis of earth- 
worm, 47 
Adamsia, food taking, 151 
Adlerz, G., imitation in ants, 210 
intelligence of wasp, 192 
Athalium, rheotaxis, 37 
Aikins, H. A. See Hodge, 89 
Aiptasia, varied reactions, 146 
effect of hunger on, 151 
habit formation, 153 
Allabach, L. F., reactions of Metri- 
dium, 160 
Allen, J. ,258 
Alligator, intelligence, 230 
Allolobophora, positive phototaxis 
in weak light, 47 
Ament, W., 258 
Ammophila, homing, 194 
stinging prey, 119, 120, 131, 
132 
using stone as a tool, 203, 204 
variability of instinct, 131, 132 
Ameeba, adaptiveness of behavior, 
70, 71 
ehemotaxis, 23, 26, 70 
electrotaxis, 59 
food taking, 64, 68, 69 
imitation of activities, 67, 68 
locomotion, 65-67 
phototaxis, 70 
reactions to contact, 33-35, 69, 
70 
Ameeba, thermotaxis, 58 
Amphibia, intelligence, 226-229 
Amphipods, phototaxis changed 
by contact, 50, 51 
thigmotaxis, 36. See also Or- 
chestia and Talorchestia 
Amphipyra, phototaxis, 36 
thigmotaxis, 36 
Amphithe, behavior, 30, 94 
Anemones. See Actinians 
Anemotropsm in insects, 38 
Anoplodactylus, phototaxis, 56 
Antennularia, geotaxis, 30 
Ants, chemotaxis, 29 
imitation in, 209, 210, 254 
influence of numbers on cour- 
age, 207 
intelligence, 192, 193, 205, 214 
variability in cocooning, 132, 
133 
Apes, intelligence, 260 ff 
Aporus, homing, 195 
Aquinas, T., pleasure as a deter- 
minant of action in ani- 
mals, 164 
Arenicola, phototaxis of larve, 52, 
53 
Associative memory, 5 ff. See 
also Intelligence 
Asterias, habit formation, 154, 155, 
158 
Atherina, intelligence, 223, 224 
Baboons, use of weapons, 267, 270 
Bacterium termo, chemotaxis, 22 
Bain, A., 178, pleasure and pain in 
accommodation, 173-175 
Balanus, phototaxis of larva, 47 
Balbiani, E. G., capture of food in 
Didinium, 78 
283 
