INDEX 



Accommodation of lens, 201. 



Acephala, chemical sense, 80 f.; hear- 

 ing, 107; vision, 130. 



Actinia, 71, 157, 169, 181, 212 f. 



Actinians, chemical sense, 69 ff.; reac- 

 tions to light, 123; geotropism, 157; 

 learning, 211, 212 f. 



Adamsia, 69 ff., 212. 



Adaptation, 45, 56, 210 f. 



Affective qualities, in mind of Amceba, 

 43. See Pleasure and Unpleasant- 

 ness. 



Aiptasia, 70 f., 190, 212. 



Alburnus, 116. 



Allolobophora, 78 f., 128, 171. 



Amoeba, 38 ff., 121, 149. 



Amphibia, chemical sense, 102; hear- 

 ing, 117 f.; vision, 141 f.; learning, 

 222, 231. 



Amphioxus, 101 f., 139 f. 



Amphipods, 83, 175. 



Amphithoe, 83. 



Anecdote, method of, 4 ff. 



Anemotropism, 57, 154, 185, 188 f., 

 288. 



Annelids, chemical sense, 78 ff.; hear- 

 ing, 107; vision, 126 f., 172; geo- 

 tropism, 159 ff.; learning, 209 f. 



Anticipatory function of ideas, 256, 



273- 



Ants, taste, 86; food-finding, 88 f.; 

 nest-finding, 90 f.; nestmates, 94 ff.; 

 hearing, 112 f.; vision, 90, 93, 198; 

 mimicry, 198; learning, 209, 211, 

 221, 227. 



Aphaenogaster, 94. 



Arachnids, chemical sense, 84 ff . ; hear- 

 ing, 109 f.; vision, 135 f.; learning, 



2O8, 2IO. 



Arbacia, 287. 

 Argiope, 199. 

 Association, 274 f. 

 Associative memory, 30, 205. 

 Astacus, 83, 109. 



Attention, 49, 241, 245, 260, 282, 



285 ff. 

 Attidae, 84. 

 Attus, 252. 



Background, influence of, in light 

 reactions, 182. 



Balanus, 133, 134, 176, 178- 



Bees, chemical sense, 97 ff.; hearing, 

 113 f.; vision, 137 ff., 196 f.; learn- 

 ing, 257, 260 ff. 



Beetles, 86, in. 



Behavior, as evidence of discrimina- 

 tion, 60 ff. 



Bembex, 263 ff. 



Beroe, 74 f. 



Binocular vision, 194. 



Bipalium, 170, 195. 



Birds, chemical sense, 102 f.; hearing, 

 119; vision, 142, 143 f.; learning, 

 119, 143, 197, 223, 227, 233, 257, 268. 



Bispira, 208. 



Blatta, in. 



Bombyx, 88. 



Branchipus, 133, 162. 



Brightness, in relation to color vision, 

 i2i, 129, 133 f., 141, 144. 145- 



Canary, 119. 



Carcinus, 83, 219 f. 



Carmarina, 73. 



Cat, 103, 165, 235 f., 239, 271, 272, 



289, 290, 292. 

 Caterpillars, 192, 196. 

 Catfish, 214. 

 Cebus, 197, 251. 

 Centrifugal force, orientation to, 54, 



152, 185. 



Centrostephanus, 131, 208. 

 Cephalopods, 130, 160. 

 Cerianthus, 70, 157. 

 Chemical sense, Amceba, 40, 42; 



cceTenterates, 67 ff.; flatworms, 75 ff.; 



annelids, 78 ff.; mollusks, 80 f.; 



325 



