INDEX 



435 



117 ; H. umbellatum, influence of 

 gravity on thermonasty of, 127 ; of 

 light, 1 06. 



Homodrompus curvature, origin of, 37 ; 

 torsion, 41. 



Homogentisinic acid, in root-apices, 227. 



Homoiotherms, 366, 367. 



Homolotropism, definition of, 155. 



Hook-climbers, 32, 33, 45, 46. 



Hook-tendrils, secondary growth of, 46. 



Hooke, 79. 



Hop, growth of, 33 ; limiting diameter for 

 twining of, 40; nutation of, 21. 



Hoppe, 372, 376. 



Hordeum, heliotropism of, 172; H. disti- 

 chum, thermonastic flowers of, 115. 



Hermann, 286, 316, 356, 357, 360, 397; on 

 streaming, 289, 292, 293. 



Horme'n, 380. 



Hot stage and gas-chamber, 315, Fig. 52. 



Hoya, mode of climbing of, 32 ; H. carnosa, 

 nutation of, 21. 



Huber, 372, 374. 



Huie, on cellular changes in Drosera, 89. 



Humic acid, use of, 228. 



Humulus, climbing-hairs of, 40 ; H. lupu- 

 lus, direction of twining of, 38 ; free 

 coiling of, 36, Fig. 8, 37 ; twining-stem 

 of, 34, Fig. 7. See also Hop. 



Hunger, 273. 



Hunter, invention of klinostat by, 166. 



Huth, 165. 



Hyacinthus, statical moment of, 236 ; H. 

 orientaltS) heliotropic roots of, 173. 



Hydra viridis, 305. 



Hydrocleistogamy, 100. 



Hydrogen, apparatus for production of, 339, 

 Fig. 58 ; influence of, on Pelomyxa, 341. 



Hydronastic movements, 97, 116-19; uses 

 of, 1 1 8. 



Hydrostatic pressure, influence of, on geo- 

 tropism, 223, 224. 



Hydrotaxis, 356. 



Hydrotropic irritability, 182; localization 

 of, 197, 198; nature of, 184, 187; of 

 rhizoids and sporangiophores, 183. 



Hygroscopic movements, 150, 151, 152. 



Hymenium, geotropism of, 165. 



Hymenomycetes, dispersal of spores of, 416. 



Hyphae, indifference of, to contact, 83. 



Hypnea musciformis, coiling of, 46. 



Hypocotyl, curvature of, on a klinostat, 27 ; 

 geotropism of, 165 ; heliotropism of, 

 J 73 J 93 5 hydrotropism of, 183 ; locali- 

 zation of irritability in, 194, 200 ; sensi- 

 tivity of, to light, 211. 



Hyponasty, definition of, 3 ; influence of, 

 on geotropism, 254 ; of gravity on, 257. 



Ihne, 380, 381. 



Illumination, changes of response to, 9. 



See also Light. 

 Ilyin, 224. 



Imbibition, influence of, on streaming, 282- 



Immotility, origin of, 306. 



Impatient^ influence of induction-shocks 

 on fruit of, 146 ; -- of darkness on 

 leaves of, 106 ; photonastic leaves of, 

 98; I.balsaminea, 148; I.glanduligera, 

 geotropic curvature of, 233, Fig. 45 ; 

 /. noli-me-tangere, dehiscence of, 148 ; 

 influence of darkness on growth of, 

 129, 132 ; of light on daily move- 

 mentsof, 105, 108-11; sleep-movements 

 of, 103 ; Lparviflora. 48, Fig. 16, 130, 

 416; influence of light on irritability 

 of, 203 ; sleep-movements of, 103. 



Indicator, influence of, on movement, 19. 



Indifferent line, 287. 



Induction-period, 211 ; after-effect of, 212. 



Induction-shocks, mode of action of, 356, 

 Fig- 63, 360. 



Inflorescences, production of heat by, 372, 

 373, 3?6. 



Infusoria, galvanptaxis of, 361, 362, 363. 



Ingestion, conditions for, 305, 306. 



Injuries, influence of, on autonomic curva- 

 ture, 31 ; on production of heat, 



375, 397, 398. 

 Inotagma, 282, 290. 

 Interprotoplasmic connexions, translocatory 



inutility of, 91. See also Protoplasm. 

 Ions, influence of, on chemotaxis, 345 ; on 



galvanotaxis, 364 ; on galvanotropism, 



421, 422. 

 Ipomoea argyroides, abnormal twining of, 



38 ; /. jucunda, reversal of twining in, 



39 ; /. purpurea, angle of twining of, 

 4.0 ; direction of, 38 ; influence of 

 light on circumnutation of, 42 ; twining 

 of, in darkness, 30 ; 7. sibirica, 42. 



Iresine Lindeni, 415. 



Iris, 415. 



Irritability, changes of, 156, 157, 202, 206; 

 distribution of, in tissues, 226 ; in- 

 fluence of ether and chloroform on, 

 144, 145; of injuries on, 198, 199; 

 of light on, 141, 142 ; of oxygen 

 on, 143 ; of temperature on, 141, 

 225 ; mode of restoration of, 79 ; nature 

 of, ii. 



Isatschenko, 382. 



Isoetes, '420. 



Ivy, geotropism of aerial roots of, 164. 



Jamieson, 269. 



Jamin, 381. 



Janse, on streaming, 284, 289, 357. 



Jennings, 266, 267, 269; on chemotaxis 

 and osmotaxis, 344, 348, 353, 358 ; on 

 galvanotaxis, 361 ; on phobism, 309, 



Jensen, 268; on geotaxis, 336, 337; on 

 protoplasmic movement, 275, 276, 

 277, 280, 283. 



Johnson, 237, 243. 



Ff 2, 



