380 



Index 



Multiple Choice Method, 298 ff. 

 Myriapods, 225. 

 My sis, 1 19. 



Necturus, 238. 



Negative reaction, varied to repeated 

 stimulus, 247 f. 



Objective methods, 20 ff. 



Olfactory cues in maze running, 281. 



Ophiura, 248. 



Orang, 300. 



Orchestia, 201 f., 204. 



Organic sensation, 3, 62. 



Oriented reactions, 176 ff. 



Orienting flights, 106. See Locality 



survey. 

 Otocysts, 116 f. See Statocysts. 



Pagurus, 89. 



Pain, 62, 83, in. 



Palsemon, 88, 118, 188. 



Palsemonetes, 118, 202. 



Paramecium, 63 ff., 174, 178 ff., 211 f., 



262, 314. 

 Patella, 85. 



Pawlow's Method, 57 f., 133, 171, 228. 

 Pecten, 217, 222. 

 Penaeus, 188. 

 Periodical changes in tropisms. See 



Rhythms. 



Photokinesis, 143 ff., 207. 

 Phototropism, 193 ff. 

 Physa, 85. 

 Physiological state, effect of, 60, 70 f., 



74, 80, 82, 86, 106, 265. 



Pig, 3o- 



Pigeon, 165, 226, 269, 275, 281 f., 312. 



Planarians. See Flatworms. 



Plants, color reactions, 158 f. 



Platyonichus, 188. 



Play, 305 f . 



Pleasantness, 45 f., 70, 143 f., 277. 



Porcupine, 271. 



Porthesia, 203. 



Preference Method, 55, 92, 154, 146 f., 



149 f. 



Prepotent reactions, 258, 260 f., 316 ff. 

 Prolonged action of light, 201 f . 

 Protozoa, 39 ff., chemical sense, 63 ff. ; 



response to change in light intensity, 



13=;; color vision, 146; geotropism, 



178 ff. 



Punishment, 263 ff., 277 f.^ 



Pupillar reflex, 157. 



Purity of water, effect on phototropism, 



203. 

 Puzzle-box experiments, 267 ff. 



Rabbits, 170 f., 267, 292. 



Raccoon, 134, 169, 224, 261, 267, 271, 

 293 ff., 297 f. 



Ranatra, 201, 203, 315. 



Random movements, 198 f. 



Rat, 132 f., 171, 224, 239, 263, 269, 272, 

 275, 280 f., 290 f ., 300, 309 ff. 



Reaction time, as evidence of discrimina- 

 tion, 83. 



Recognition of visual landmarks, 233 ff. 



Repeated stimuli, reaction to, 246 ff., 

 251 ff. 



Repetition, ^Law of, 257 f . 



Reptiles, hearing, 131 ; color vision, 

 163 f . ; distance perception, 140 f. 



Rest, effect on phototropism, 206 f. 



Reward, 266 ff., 277 f. 



Rheotropism, 178, 211 f. 



Rhythms, acquired, 284 f. 



Righting reaction, 178, 183, 188. 



Sagartia, 74, 137- 



Salamander, 163 f., 238. 



Salivary reflex, 57. 



Sarsia, 137 f. 



Sea-anemones, 71 ff., 137, 182, 193, 251, 



254 f., 256, 259. 

 Sea-urchin, 175, 187, 252, 315. 

 Semi-circular canals, 190 ff. 

 Sense-organs, significance of, 317. 

 Sensibility to difference, 142 f. 

 Serpula, 148. 



Sex, effect on learning, 311. 

 Sex reactions, 89, 93 f . 

 Simocephalus, 150. 

 Size, visual perception of, 222 ff. 

 Skin sensitiveness to light, 160, 163 f. 

 Skioptic reactions, 138 ff. 

 Slug, 185, 203, 247. 

 Snail, 84 ff., 185 f., 259. 

 Space perception, 176, 216, 242 ff. 

 Sparrow, 268. 



Spatially determined reactions, 172 ff. 

 Spider, 5 ff., 89, 119 f., 154, 221 f., 237 f., 



242, 252, 258 f. 

 Spirographis, 193. 

 Squid, 209. 

 Squirrel, 271, 312. 



