398 



INDEX 



146; locomotion of, 147; orienta- 

 tion and change in sense of, 147, 

 231; 171; aggregation of , 242. 



Euglena, viridis, 16; method of ag- 

 gregation (Engelmann), 17; 36; 

 45; description of, 80-82; aggrega- 

 tion of (Engelmann), 82; orienta- 

 tion of (Jennings) , 83, 84, (Torrey), 

 84, 85; orientation in light from 

 two sources, 86, 87, no; different 

 species and collection of, 89, 90; 

 locomotion of, 90, no; accuracy 

 of orientation, 92; mechanics of 

 orientation, 92-99, 102-104, no; 

 discussion of orientation, 99-102; 

 distribution of sensitive tissue, 

 104-106, in; function of eye- 

 spot, 98, 99, 102, 106-109, in; 

 sensation in, 112; 115; 118; 122- 

 137; 142-148; 156; 161; 174; orien- 

 tation compared with that in Are- 

 nicola larvae and Musca larvae, 

 169, 171, 195; 209; 210; 215; 216; 

 229; 230; adaptation, 236; 243; 

 257; 259; 261; 263; reversal in 

 reaction and effect of tempera- 

 ture, 265, 267, 274-279; deses, 

 viridis, spiragyra, 274; 301; reac- 

 tions in spectrum, 324, 325, 361; 

 366; 368. 



Evolution, effect of theory of, on 

 behavior, 9, 10; 52; natural selec- 

 tion, 238, 239; of reactions to 

 light, 262, 263. 



Ewart, protoplasmic streaming, 74. 



Eyes, function of, in reactions: flies, 

 216, 217, fiddler crab, 217, Rana- 

 tra, 218, toads and frogs, 219- 

 223, arthropods, 226, 227, birds, 

 228, 233; function of, in aggrega- 

 tion, 244. 



Eye-spot, in Euglena: structure of, 

 81, 82, function of, 98, 99, 102, 

 106-109, in; in Trachelomonas : 



structure of, 128, 129, function 

 of, 109, 130; in Chlamydomonas: 

 function of, 109, 133; in Chloro- 

 gonium, function of, 134; in Eu- 

 dorina and Pandorina, structure 

 and function of, 147, 148; lumi- 

 nosity of, in direct sunlight, 147; 

 in Arenicola lar\^ae: 166, function 

 of, 171, 172, 174; function of, in 

 starfish, 211; summary of function 

 of, 230. 



Famintzin, change in sense of re- 

 action, 265. 

 Fechner, 9. 

 Fielde, 354. 

 Figdor, sensitiveness of plants, 288, 



313- 

 Fishes, adaptation in blind, 238; 

 function of skin in response, 262; 

 343; color vision in, 358-360, 



364- 

 Flagellata,36;37; 229; 230; 232; 233; 



aggregation of, 242; reactions in 



spectrum, 324, 325. 

 Flies, circus movements in, 216, 



217; function of eyes in reactions, 



216, 217; adaptation, 237. See 



Musca. 

 Forbes, 312. 

 Forel, 354. 

 Frandsen, 265. 

 Frank, geotropism, 12. 

 Fraunhofer, brightness in spectrum, 



305-307. 

 Frogs, aggregation of, 244; 260; re- 

 versal in reactions, 273; 278; See 



Bufo. 

 Fulgides, reversible in light, 308- 



310. 

 Fundulus, reactions to shadows, 247; 



257; 260. 

 Fungi, reactions of, in spectrum, 



317-319- 



