INDEX 443 



123, 124, 175 ; response of leaf to direct radio-thermal stimulation, 179 ; 

 response to high-frequency alternating field of electric force, 185 ; 

 autonomous pulsation of, 269 



Mimosa pudica, diurnal movement of : four phases in, 267 ; summer and 

 winter curves of, 268 ; combined effects of thermo-geotropism and 

 photo-geotropism, 269, 430 ; spasmodic fall of leaf in the evening, 

 271, 431 ; after-effect of light at pre-maximum, maximum, and 

 post-maximum, 277, 278, 431 



Mimosa pudica, pulvinus of : characteristics of, 158, 164, 165 ; detection 

 of gradation of moto-excitability in lower half, 163 ; velocity of trans- 

 verse conduction, 162 ; response to Ught acting from above and below, 

 160-3 '> triphasic response of, 166 ; response to radio-thermal stimula- 

 tion, 167; diurnal variation of geotropic torsion, 273; effect of CO2 

 on geotropic response of, 303 



Mimosa pudica, photonastic response of leaflet of, 157, 158, 169 ; effect of 

 light applied above and below, 169 



Nadirotropism, 290 



Nastic movement, definition of, 216 



Negative phototropism : of shoot, 137 ; continuity between positive and 

 negative, 138, 139 ; of root, 139 ; transformation from positive to, 146 



Negative radio-thermotropism : in shoot, 180 ; in root, 181 



Nemec, cited, 329, 373 



Non-polarisable electrodes, 317 



Noon, difference between light, and thermal, 202 



Nymphaea, diurnal movement of, 218 ; two types of thermonastic move- 

 ments of, 222, 223 ; distribution of geotropic excitability in peduncle 

 of, 338, 339 ; localisation of geo-perceptive layer, 339 ; critical angle 

 for geotropic excitation, 360, 361 



Optical Lever, for measurement of rate of growth, 5 ; for measurement 

 of rate of autonomous torsion, 382 



Optimum temperature for growth, 36 



Oryza, fatigue-relaxation under continuous stimulation, 136 ; trans- 

 formation from positive to negative phototropic curvature under 

 prolonged unilateral exposure to light, 138 



Oscillating Recorder, the quadruplex type, 209 



Palm, diurnal movement : of ' Praying,' 224 ; of Sijbaria, 231 ; of Kentia, 



232 

 Papaya, diurnal record of leaf, 240 

 Passiflora, response of tendril : effect of indirect mechanical stimulation, 



95 ; relative intensities of upper and under sides, 98 ; inhibitory action 



of stimulus on, 99 

 Perceptive organ, root- tip the geotropic, 372 

 FieSer quoted, 2, 97, 174, 401 ; cited, 217, 271, 272 

 Phaseolus, variation in the rate of torsion under changed rate of ascent 



of sap, 386 

 Photic and geotropic stimulation, certain resemblance between reactions 



to, 289 ; difference between effects of, 373 



