INDEX 



399 



Galen, experiments on animals, 6. 

 Galvanotropism, compared with 



heliotropism, 28, 29; 56; 119; in 



Vol vox, 145, 146, 

 Gamble, 354. 



Gammarus, 279; 300; 346; 367. 

 Gardner, reactions of seedlings in 



spectrum, 314, 319. 

 Geometra, 346. 

 Geotropism, 13. 

 Gonionemus murbachii, orientation 



in, 164; 251; 252; 257; 259; 266. 

 Graber, preference method, 10; 14; 



24; 27; 34; theory of reactions, 



218; 223; 235; effect of color on 



reactions of higher animals, 343- 



346; 350; 353; 354- 

 Gramineae, 68; 229; 259; change in 



reactions, 285. 

 Groom, 266. 

 Guillemin, reactions of seedlings in 



spectrum, 314, 317, 319. 



Haberlandt, 59; function of epider- 

 mal cells in reactions to light, 72. 



Hadley, definition of tropism, 56; 

 214; 222; orientation in lobster 

 larvae, 226; reversal in reactions 

 of lobster larvae, 264, 266, 286. 



Haematococcus, 272; 274. 



Hargitt, 160; 247; reactions of Hy- 

 droides, 249; reactions of Eloactis, 

 252; variation and modification 

 of reactions of Hydroides, 292- 



295- 



Harper, orientation in earthworms, 

 199; 200-205; 214; 215; orienta- 

 tion in Corethra larvae, 225. 



Harrington and Leaming, move- 

 ment of Amoeba, 74; 322; reac- 

 tions of Amoeba in spectrum, 327, 

 328, 331. 



Harvey, experiments of, on the cir- 

 culatory system, 6; 51. 



Haycraft, brightness in spectrum, 

 306, 307. 



Hedista, 286. 



Hehotropism, origin of term, 12; 

 Sachs' theor>' of , 13-16; compared 

 with galvanotropism, 25-3 1 ; Loeb's 

 theory of, 28-33; compared with 

 Unterschiedsempfindlichkeit, 32, 

 2,2), 254-256; Verworn's theory of, 

 36-38; defined, 53-56, 253-256; 

 of Euglena, 85, 104; compared 

 with galvanotropism in Volvox, 

 145, 146; 164; 227; in birds (Cole), 

 228; 266; in plants and animals 

 compared, 346. See Orientation. 



Helix hortensis, 251; 366. 



Helmholtz, 9. 



Hertel, response to ultra-violet in 

 Paramecium, 134. 



Hesse, 247. 



Hewitt, 184. 



Hofmeister, heliotropism, 12; curva- 

 ture in single-celled structures, 

 71; Plasmodia, 74. 



Holmes, orientation: selection of 

 random movements as a factor in, 

 50, 51, 196, 197; definition of trop- 

 ism, 55; 58; effect of light inten- 

 sity on rate of movement, 100, 

 loi ; orientation in Musca larvae, 

 176; 183; 189; trial movements in 

 earthworms, 198; 203; 204; 214; 

 on circus movements, 215, 217; 

 on orientation, 218; 223; 226; 227; 

 232; reversal in reactions, 271, 

 273, 279, 280; effect of contact on 

 reactions, 284; modification in re- 

 actions of Ranatra, 296. 



Holothurian, orientation of, 211. 



Holt and Lee, 42; reactions of Sten- 

 tor, 113; 205. 



Hydra, 34; 48; effect of light inten- 

 sity on activity, 150-152; orienta- 

 tion and locomotion, 1 51-15 7, 



