INDEX 



407 



bacteria, 325, Amoeba, 327, 330- 

 332, Hydra, 334, 335, Daphnia, 

 337-341, Simocephalus, 341-343, 

 worms, spiders, insects, moUusks, 

 fishes, amphibia, reptiles, birds, 

 mammals, 343-346, ants, 348-352, 

 bees, 352-355, higher Crustacea, 

 355-358, fishes, 358-360, birds and 

 mammals, 360, general, 361, 362, 

 367; for fishes and dancing mouse, 



359, 360. 



Sphinx, 346. 



Spider, water, reversal in reactions, 

 277, 300; 343; 354; color vision 

 in, 364. 



Spirographs spallanzani, 2)y') 247; 

 254; 255; 258. 



Stahl, 74; light reactions in Euglena, 

 82; 265. 



Starfish. See Echinoderms. 



Stenorynchus, 355; 358. 



Stentor coeruleus, 42; orientation in 

 light from two sources, 87, 115, 

 116; distribution of sensitive tissue 

 in, 114, 119-121; mechanics of 

 orientation, 114-119, 122; reac- 

 tions when attached, 115; aggre- 

 gation of, 121, 241; activity in 

 different intensities of light, 123; 

 124; 126; 127; 132; 137; 156; 

 orientation compared with that 

 in Musca larvae; 195; 215; 229; 

 230; adaptation, 237; 250; 257; 

 259; 261; 263; 270; 277; 280; 

 variation in sensitiveness, 291, 

 301, 368; 297; 300; variation in 

 reactions, 374. 



Stentor viridis, aggregation of, 240; 

 effect of oxygen on reaction, 279. 



Stimulation, differential response to 

 localized, in: Euglena, 83, 10 1, 

 Stentor, 121, Oedogonium swarm- 

 spores, 128, Volvox, 137, Hydra, 

 158, Eudendrium, 162, medusae, 



164, 165, Arenicola larvae, 174, 

 fly larvae, 195, earthworms, 200, 

 201, 205, Planaria, 206, 210, vari- 

 ous species, 214, Caprella, 225, 

 arthropods, 226; general, 48; 

 Summary of, 230-235. 

 Stimulus, transmission of, in plants, 

 12, 21; fundamental cause of 

 (Jennings), 50; 59; orienting, 

 cause of in: Euglena, 94, 98, 

 Stentor, 118, Oedogonium swarm- 

 spores, 127, Paramecium, 134, 

 135, Volvox, 144, Hydra, 157, 

 Eudendrium, 163, Arenicola lar- 

 vae, 1 71-174, Musca larvae, 194, 

 195, earthworms, 204, 206, Plan- 

 aria, 208, 210, Echinoderms, 212, 

 Ranatra, 218, frogs and toads, 

 219, 223, gramineae, myxomy- 

 cetes, rhizopods, and various other 

 organisms, 229-235; a sign as a 

 cause of, 243; cause of, in reac- 

 tions to shadows, 250; cause of 

 (constant intensity), 252, 253; 

 cause of, in reactions to light 

 (Davenport), 254-256; character 

 of, 256-258. 

 Stobbe, on reversible photochemical 



reactions, 308-312; 336. 

 Strasburger, reactions of swarm- 

 spores to light, 15, 123; 16; 27; 

 40; effect of light intensity on 

 rate of movement, loc; 124; 

 reversal in reactions of swarm- 

 spores, etc., 265, 272-274; change 

 in optimum, ^88; 290; reactions of 

 swarm-spores in spectrum, 221, 

 222. 

 Swarm-spores, 87; rate of movement 

 in different intensities of light, 

 100; aggregation of, 241; 257; 259; 

 change in sense of reaction, 265; 

 272; 274; reactions of, in spec- 

 trum, 321, 322, 361. 



