Index 



379 



in echinodenns, i86 f.; in Crustacea, 

 i88 f . ; in vertebrates, igo ff. ; psychic 

 aspect, iga ; effect on light reactions, 

 209 ff. 



Gonionemus, 76 f., 138 f., 144, 183, 201, 

 215. 



Guinea-pig, 310. 



Hans, Clever, 307. 



Harmful movements, dropping off, 



261 f. 

 Hearing, in lower invertebrates, 116 ff., 



in Crustacea, 118 £. ; in spiders, 119 f. ; 



in insects, 121 ff.; in fishes, 126 ff.; 



in amphibia, 130 f.; in reptiles, 131; 



in birds, 131 f.; in mammals, 132 ff. 

 Hedista, 206. 

 Heightened reaction to repeated stimuli, 



246 ff. 

 Helix, 84 f. 



Hermit crab, 87, 206, 260, 

 Hippolyte, 207. 

 Homing, in ants, g6 ff . ;' 230 f . ; in bees, 



231 f. ; in pigeons, 237. 

 Horse, 299, 307 i. 

 Hunger, 203, 253, 254 f. 

 Hydra, 69 f., 137, 143, 146, 182, 247; 



249, 251, 256 f. 



Ideas, 33 f., 47 ff., 250, 264, 287 ff. 

 Image, visual, 218 ff. 

 Imitation, instinctive, 288 f . 

 Imitation, inferential, 289 ff., 296 f., 302. 

 Incidental cues, response to, 58. 

 Individual differences in learning ability, 



312. 

 Infancy, value, 306 f . 

 Insects, chemical sense, 90 ff. ; hearing, 



121 ff. ; photokinesis, 144; color 



vision, IS4 ff. ; geotropism, 189 f., 



210; size perception, 223. 

 Instinct, 291, 317. 



Intensity of light, effect on tropism, 201 . 

 Intensity theory of tropism, 19s f. 

 Interference of habits, 3T1 f. 

 Interference of stimuli, 313 ff. 

 Interpretation of behavior, methods, 



13 ff- 

 Invertebrate eye, simple, 217. 



Jassa, 203. 



Jellyfish, 75 ff., 137 f., 17s, 183. 



Kinsesthetic sensation, 62, 280 ff. 

 Kinesthetic memory, 100, 282 f., 300 f. 



Labidocera, 201, 204. 



Lacrymaria, 69. 



Landmarks, recognition of, 286 f. 



Lateral line organs, 128 ff. 



Learning, 30 ff., 24s ff., 257 ff. 



Leech, 83 f., 139 f., 194. 



Light intensity, change of, 13s ff. 



Limax, 203. 



Limpets, 85. 



Limulus, 90. 



Lineus, ifj. 



Littorina, 205 f., 209, 222 f. 



Lloyd Morgan's Canon, 31, 264, 287. 



Lobster, 194. 



Locality memory, 232 f. 



Locality survey, 233 f . 



Localized stimulus, reaction to, 59, 



173 ff. ■ 

 Lymnsea, 85. 



Macromysis, 207. 



Mayfly, 203, 266 f., 312. 



Maze method, 272 5. 



Maze, rotated, 282. 



Maze running, sensory cues in, 280 ff. 



Mechanical stimulation, effect on photot- 

 ropism, 203 ff., 207. 



Mechanism, 22. 



Metridium, 73 f., 137, 254 f. 



Microstoma, 80. 



Migration, of fish, in; of birds, 113. 



Mimicry, 230. 



Mind, evidence of, 27 ff. 



MoUusks, chemical sense, 84 5.; hear- 

 ing, n7; response to change of light 

 intensity, 140; color vision, 148; 

 geotropism, 185 f. ; 2x0; size percep- 

 tion, 222 f. ; ^adaptation, 252; learn- 

 ing, 257. 



Monkeys, lis, i69> 171. 224, 227 ff., 

 -^ 261, 270 £., 27s, 290, 296 ff., 299 f. 



Mosquito, 194, 252. 



Moth, 123. 



Mouse, 171, 238 f. 



Mouse, dancing, 169 {., 228, 275, 290, 

 310 ff. 



Movable sense organ, 243 f . 



Movements, variety of, condition of 

 memory ideas, 304 f. 



Movement sensations, attention to, 



30s L 

 Movement vision, 216 f. 

 Moving stimulus, response to, 76, 



215 ff-. 317- 



