LIST OF ILLUSTRATIONS XXIX 



FIG. PAGE 



204. Transverse section of the stem of Bryophyllum . . . 341 



205. Diagrammatic representation of inducing the geotropic 



reaction of the shoot by the Method of Reversal . . 349 



2g6. Alternate geo-electric response at + 45° and — 45°, also 



+ 90° and — 90° (jNIethod of Vertical Rotation) . , 350 



207. Records of geo-electric response at various angles (Tropaeolum) 353 



208. Geo-electricresponseat 45°, 135°, and 45° in sequence . . 355 



209. Curves showing values of sines and of reactions . . . 359 



210. Abrupt geo-electric response at an inclination of 31° 



(Tropaeolum) ........ 361 



211. Diagrammatic representation of mechanical and electric 



response of root to indirect stimulation .... 366 



212. Diagrammatic representation of geo-electric response of root- 



tip . . . . . . . . . . 368 



213. Diagrammatic representation of geo-electric response in 



growing region of root . . . . . . -370 



214. Method of measurement of Circumnutation of a twining shoot 379 



215. Measurement of relative activities of successive internodes . 379 



216. Torsion of the ridges of stem. Stem twining anti-clockwise 



round support (Thunbergia coccinea) . . . .381 



217. Method of Optical Magnification ..... 383 

 2t8. Automatic Recorder of Torsion ...... 3S5 



219. Death-spasm at fatal temperature of 60° .... 390 



220. Effect of Formaldehyde on torsion ..... 39I 



221. Effects of Chloroform and Ether on torsion . . . 392 



222. Direction of normal torsion reversed under electric stimu- 



lation (Thunbergia) ....... 396 



223. Automatic record of diurnal variation of torsion . . . 408 

 [Diagrammatic representation of torsional response of aniso-' 



"^' - tropic organs to unilateral stimulation by light ; pulvinus ■ 412 

 ' of INIimosa and twisting stem 



226. Optical ]\Iethod of observing rate of torsional movement under 



unilateral stimulation by gravity . . . . .414 



227. Torsional response of the stem to stimulation of its 



different sides by gravity . . . . . .415 



228. Combined effects of simultaneous geotropic and photic stimu- 



lation on autonomous torsion . . . . . .418 



