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 

 JSthalium, 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 phototaxia 



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 



Amceba, adaptiveness of behavior, 



70, 71 



chemotaxis, 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 



Amceba, 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 

 Amphithce, 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 larvae, 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 



