45 



INDEX 



growth of, during curvature, 239 ; in- 

 fluence of chloroform on geotropism of, 

 145 ; length of irritable zone in, 198 ; 

 pressure exerted by radicle of, 238 ; 

 production of electricity in, 395 ; trau- 

 matropism of, 186, Fig. 40; V. sativa, 

 182, 335 ; curvature of etiolated seed- 

 lings of, 23 ; heliotropism of epicotyl 

 of, 194; rheotropism of root of, 184, 

 185, Fig. 39; time of reaction of, 211. 

 Victoria regta, sleep-movements of, 103 ; 

 temperature of flower of, 373, 376. 



Villari, 392. 



Vtnca, 259 ; plagiotropism of radial runner 

 of, 156, 157; V. major ; orientation of, 

 250. 



Vines, 106, 173; on heliotropism, 229; on 



protoplasmic contraction, 78, 79. 

 Viola, 257 ; origin of peduncular curvature 

 in, 27 ; sleep-movements of, 103. 



Viscosity, of protoplasm, 277 ; - - influence 

 of, on streaming, 288, 300, 313, 314, 

 316, 342 ; -- on movement in cell, 334. 



Viscum, orientation of, 173, 255. 



Vitality, relation of, to streaming, 285. 



VttiSy 42; heliotropic tendrils of, 171 ; V. 

 inconstans, disks of, 47. 



Vochting, 19, 27, 102, 103, 104, 106, 183, 

 232, 237, 253, 254, 255, 258, 260, 419; 

 on influence of light on irritability, 203, 

 204, of transplantation, 205 ; on 

 localization of sensation, 196 ; on 

 plagiotropism, 257 ; on rectipetality, 

 190; on thermonastic movements, 114, 

 115 ; on tropism, 161. 



Voegler, 316, 344, 345, 354. 



Volkens, 380. 



Volvocineae, chemotaxis of, 347, 348 ; pul- 

 sating vacuoles of, 293, 294. 



Volvox, 294, 324 ; ciliation of, 264 ; har- 

 monious working of, 269 ; locomotion 

 of, 266. 



Vorticella, 281 ; irritable zones in, 363. 



Voss, on twining of Bowiea, 35, 48. 



Vriese, 372, 374, 375. 



Vrolik, 372, 374. 



Wachtel, 237 ; on irritability of root-apex, 



197, 198. 

 Wai den, 390. 



Wallengren, 303 ; on galvanotaxis, 361, 363. 

 Waller, 342 ; on production of electricity, 



39i, 392, 394-7- 



Walz, 150, 153, 318. 



Warming, 114. 



Wartman, 394. 



Wasielewski, on amitosis, 303. 



Water, escape of, from pulsating vacuoles, 

 296, - - from stimulated cells, 17, - 

 pulvini, 76, 77, 78, during curvature, 

 282, 283 ; influence of, on curvature, 

 J 8> 355 ! - - of movements of, on pro- 

 duction of electricity, 396 ; - - of, on 



streaming, 356; movements of, 410, 

 - in climbers, 33 ; - - in streaming 

 cells, 290, 291. 



Weber's Law, 213, 214, 215 ; application 

 of, to chemotaxis, 355, to photo- 

 taxis, 322. 



Weeping Willow, torsion of, 233. 

 Weinzierl, on influence of curvature on 



elasticity, 246. 

 Went, 164, 173. 

 Werner, 303. 

 Westermaier, 235. 

 Wichura, 24, 151. 

 Wiedermann, 384, 388. 

 Wiedersheim, on curvature of operated 

 pulvini, 138; on nastic movements, 

 416 ; on return curvatures, 130. 

 Wieler, 182. 



Wiesner, 12, 19, 25, 31, 42, 106, 208, 220, 

 232-5, 237, 253-7, 260, 289, 367, 374, 

 381 ; on causes of heliotropism, 246, 

 247 ; on directive action of light, 228, 

 236; on hydronastic movements, 117, 

 118; on heliotropic action of different 

 rays, 176; on heliotropism of tendrils, 

 171, 172, 173, 175; on influence of 

 fertilization on irritability, 205 ; on 

 minimal heliotropic stimuli, 210, 211 ; 

 on tropism, 161, 164, 165, 167 ; on 

 tropic after-effects, 212 ; on undulating 

 nutation, 23 ; on Weber's Law, 213. 

 Wigand, 166, 237, 291, 315; on streaming, 



284-7. 



Wille, 46, 263. 

 Williams, 346. 

 Wilsing, 372. 

 Wilson, E. B., 303. 

 - W. P., 106, 142. 

 Winkelmann, 384, 390, 396. 

 Winkler, 20, 31, 174, 325, 329; on coiling 



of Spirogyra, 38. 

 Winogradsky, 318, 320, 321. 

 Winter, 173. 



Wistaria chinensis, length of vessels in, 

 33 ; limiting diameter for twining of, 

 40. 



Wittrock, 103. 

 Wjasemsky, 392. 



Wolkoff, 175 ; on heliotropism, 229. 

 Wollny, 381. 

 Wood, red and white, mechanical properties 



of, 414; production of, 415. 

 Wood vessel, diagram of, 411, Fig. 69; 



length of, in climbers, 33. 

 Work, energy of, in Diatoms, 272 ; done 



by plants, 401, 412, 413. 

 Woronin, 153, 173, 265, 293, 324. 

 Wortmann, 21, 28, 82, 165, 170, 244; on 

 coiling of Phycomyces, 46 ; on hydro- 

 tropism, 183 ; on mechanism of curva- 

 ture, 245 ; on thermotaxis, 317 ; on 

 thermotropism, 177 ; on tropic aggre- 

 gation, 219. 



