396 



INDEX 



forms, 321-332, Simocephalus, 

 341-343, higher animals, 343-346, 

 ants, 348-352, bees, 352-355, 

 higher Crustacea, 355-358, fishes, 

 358-360, birds and mammals, 360; 

 effect of impurity of, on reactions, 

 310, 313, 322, 335, 340, 362; 

 selection of, in crabs, 356-358. 

 See Spectrum. 



Concentration of medium (mechani- 

 cal stimuli). See Reactions. 



Copepods, 273; 274. 



Corethra larvae, orientation in (Har- 

 per), 225. 



Cowles, 211; direction of righting 

 reactions in starfishes, 213; 328. 



Crab, fiddler: reactions to light, 217, 

 218; Hermit, see Pagnrus; 258; 

 effect of color on reaction (decora- 

 tion), 355-358. 



Criticism, of Darwin by Sachs, 21; 

 of Loeb's theories of orientation, 

 26, 27, 31, 70, 80, 83, 87-89, 104, 

 no. III, 119, 122, 137, 144, 164, 

 168, 171, 173, 177-180, 182, 183, 

 188, 192-195, 198, 205, 206, 209, 

 220, 221, 223, 225, 229, 230, 233- 

 235, 242, 258, 351, 363, 364; of 

 Loeb and Sachs by Verworn, 38; 

 of Sachs' ray-direction theory, 70, 

 80, 87, III, 137, 144, 158, 182, 

 192, 198, 233; of Pollock's theory 

 of curvature in roots, 71; of Jen- 

 nings by Torrey, 84, 85 ; of Torrey 

 on orientation in Euglena, 85, 86, 

 loi, 104, III, 205; of Radl's the- 

 ory of orientation, 43, 234; of 

 Bancroft on orientation, 145; of 

 Verworn's theory of orientation, 

 104, 122, 168, 171, 173, 205, 229, 

 234; of Parker and Arkin on ori- 

 entation in earthworms, 202, 203; 

 of Holt and Lee on orientation, 

 205; of Bohn on orientation, 220, 



221; of Davenport on orientation, 

 234; of Loeb on cause of aggre- 

 gation in Planaria, 245; of classi- 

 fication, 255, 256; of Loeb on 

 regulation and adaptation, 266, 

 267, 272, 369, 371, 372; of Loeb 

 on cause of change in reactions, 

 287, 301; by Loeb on Lubbock's 

 experiments on Daphnia, 335, 336; 

 of Loeb on reactions in spectrum, 

 2,2>^, 346, 347, 363, 364; of Sachs' 

 hypothesis on effect of different 

 rays, 363; of Davenport on reac- 

 tion in spectrum, 363; of Jennings 

 on regulation, 377; of Driesch on 

 regulations, 378. 

 Crustacea, 42; 238; reactions to 

 shadows, 249; decapod, 264; 272; 

 354; modifiability in reactions, 



355-358; 364. 



Cryptomonas, 132. 



Cuma rathkii, adaptation, 238; 272; 

 346. 



Cyclops, 277; 279; 280-283; 300- 



C>T)ridopsis, 284. 



C>T)ris, 214; 274; 277; 278; 280-283; 

 300. 



Czapek, curvature of roots con- 

 trolled by root-tip, 21; 59; 72. 



Daly ell, 247. 



Daphnia, 214; 255; orientation of, 

 264; 265; 274; 277; 279; 280-283; 

 300; effect of different wave- 

 lengths on reactions of, 310; reac- 

 tions in spectrum, 335-341, 362; 



345; 350; 364- 

 Darkness, effect of, on movement: 

 in Hydra, 152; in Hydra, etc., 



245- 

 Darwin, 9; 10; 12; theory of orienta- 

 tion in plants, 18-21; transmis- 

 sion of stimuli in plants, 19; 23; 

 31; 47; 52; definition of tropism. 



