440 INDEX 



Electric stimulation, effect of, on growth, 62, 423 ; latent period of 

 response to, 64 ; effect of increasing intensity and duration of, 65, 

 68 ; effect of continuous application of, 66, 68 ; continuity of effect 

 between incipient and actual contraction under, 67 ; effect of direct 

 and indirect, on tendril, 91 ; after-effect of, 92 



Electrodes, non-polarisable, 317 



Electromotive response, under unilateral stimulation at proximal and 

 distal sides : of tendril, 95 ; of stem, 130 



Electromotive response, positive, diphasic, and negative, under increasing 

 intensity of indirect stimulation, 128. See also Geo-electric response 

 of shoot and of root 



Erythrina indica : latent period for photic stimulation, 106 ; positive 

 phototropic curvature of, 104 ; characteristics of phototropic curve 

 of, 149 ; effect of COg on geotropic response of, 303 



Ether, effect of vapour of : on growth, 44, 293, 422 ; on geotropic 

 response, 298 ; on autonomous torsion, 393, 434 



Fatigue-relaxation : of growth under prolonged stimulation, 136 ; 



reversal of tropic curvature from positive to negative by, 137, 138 

 Fitting, cited on response of tendril, 97 



Force, active nature of force in diurnal movement of ' Praying ' Palm, 229 

 Formaldehyde, effect of, on autonomous torsion, 392 

 Frictional stimulation, effect of, on growth, 87, 93 



Galvanograph, 200 



Geo-electric response of shoot : discovery of, 314 ; latent period of, 322 ; 

 method of contact with sensitive and indifferent points, 318 ; electro- 

 motive variation at upper and at lower side, 319 ; methods of Axial 

 and of Vertical rotation, 320 ; characteristics of, 321 ; physiological 

 character of, 323 ; relation between angle of inclination and, 324 ; 

 law of sines, 325 ; the Electric Probe, 328 ; localisation of geo- 

 perceptive layer in, 329 et seq., 432 ; distribution of excitability at 

 different depths, 332 ; curve of geotropic excitability, 334, 335 ; 

 duplication of geo-perceptive layer and of starch-sheath, 345, 432 ; 

 intensity of response at various angles of inclination, 353 ; critical 

 angle for, 360, 432 ; effect of repetition on critical angle for, 363 



Geo-electric response of root : at the region of tip, 368, 433 ; at the 

 region of growth, 369, 370, 433 ; additive action-current between 

 tip and growing region, 370 



Geo-perception by tip of the root, 372 



Geotropic curve : complete record of, 286 ; effect of season on, 294 ; 

 effect of chloroform on, 296 ; effect of ether on, 297 ; effect of COg 

 on, 299 



Geotropic excitation, differential, in upper and lower halves of dorsi- 

 ventral organ, 290, 302 



Geotropic stimulation, 281-4 ; determination of direction of, 284, 287, 

 308, 431 ; latent period of effect of, 294 ; algebraical summation of 

 effects of photic and, 288, 308 ; certain analogy between effect of 

 photic and, 288, 289 ; difference between response to photic and, 373, 

 433 ; difference of response to, in shoot and in root, 372, 433 



