INDEX 



Acacia, 286. 



Acclimatization, Euglena, 103; Vol- 

 vox, 141; Hydra, 152; Stentor, 

 119; Musca larvae, 189, 190, 197; 

 to change of intensity, 248, 249; 

 288-297. 



Acids, effect of, on reversal of reac- 

 tions, 279-283, 300. 



Acris, 260. 



Actinia, reaction to sudden increase 

 of intensity, 250; reaction to con- 

 tinued illumination, 252; 257. 



Actinia equina, 286. 



Adams, orientation in earthworms, 

 198; 201; 266. 



Adaptation, Verworn on, 36; in re- 

 actions in plants, 72; in Arenicola 

 larvae, 167; in reactions of but- 

 terflies, 227; in Euglena, Chlamy- 

 domonas, Volvox, Stentor, 

 Amoeba, etc., 236-239; natural 

 selection, 238, 239; 285; 292; 

 297; 298; in ants, 351; 368; 

 chemical regulation of, 370. 



Aggregation, method of in : Euglena 

 (Engelraann), 16, Paramecium 

 Qennings), 45, Volvox, 144, coe- 

 lenterates, 149, Planaria, 206, 

 frogs, 219, general, 239-245; cause 

 of, 242, 243. 



Aiptasia annulata, reactions of 

 (Jennings), 252. 



Algae, 265. 



Alkalis, effect of, on reversal of re- 

 actions, 279-283, 300. 



AUolobophora foetida, 199; 266. See 

 Earthworm. 



Alona, 278. 



Amaranthus, 288; 313. 



Amoeba, 48; reactions to light, 74- 

 80; process of orientation, 76-79; 

 effect of change of light intensity 

 on movement of, 76-79; adapta- 

 tion, 237; 257; 263; 270; 322; 

 reactions of, in spectrum, 327-332, 

 361; effect of change of intensity 

 and color on movement of, 328, 



2>2>o, 331; 2>(^yy 365- 



Ampelopsis, 265. 



Amphibia, function of skin in re- 

 sponse, 262; 343. See Bufo. 



Amphioxus, reaction to sudden in- 

 crease of intensity, 250; 257; 259. 



Amphipods, 216. 



Amphitrite bomb>'x, 247. 



Andrews, 247. 



Animal behavior, effect of theory of 

 evolution on, 9, 10; relation to 

 psychic phenomena, see Psychic 

 phenomena; summary of Loeb's 

 ideas on, 34, 35; analysis of (Jen- 

 nings), 49, 50; Drieschon,374-378. 



Annelids, tubicolous, reactions to 

 shadows, 247. See Hydroides. 



Anomura, 214. 



Ants, modification in reactions of, 

 296, 297; reactions to colors, 

 348-352; effect of ultra-violet 

 rays on, 349; sensation in, 350; 

 change in reactions of, 351. 



Area, 247. 



Arenicola larv^ae, orientation in light 

 from two sources, 87; description 

 of, 166, 167; locomotion, 167; 



393 



