INDEX 445 



Radio-thermotropism of shoot : response to longitudinally transmitted 

 impulse, 177 ; positive curvature under moderate unilateral stimu- 

 lation, 178 ; neutralisation, 179, 180 ; gradual transformation from 

 positive to negative curvature under prolonged stimulation, 180, 181 



Radio-thermotropism of root : continuity between positive and negative 

 curvature under continued stimulation, 181 



Recorder, High Magnification Crescograph, 6, 420 ; Magnetic Crescograph, 

 19, 421; Balancing by Falling Weight, 23; Balancing by Inclined 

 Plane, 29; Phototropic, for Shoot, 103 ; Phototropic, for Root, 140 ; 

 Radiographic, 197,206; Galvanographic, 200; Thermographic, 210; 

 Thermonastic, 220, 221; for diurnal movement: of plants, 209; of 

 trees, 227 ; Torsional, 251, 252, 306 ; Ouadruplex Geotropic, 282 ; 

 Optical, for torsion, 382 ; Mechanical, for torsion, 384 



Root, electric response of, at growing region : to direct and indirect 

 stimulation, 366 ; geo-electric response of. 367-70, 432 



Root, tropic response of : to direct and indirect photic stimulation, 141, 

 365 ; gradual phototropic reversal from positive to negative in 

 Sinapis, 145 ; to indirect radio-thermal stimulation, 177 ; to direct 

 unilateral stimulation, 178 ; gradual reversal of positive to negative 

 under continued unilateral stimulation, 179, 180 



Root-tip, effect of unilateral stimulation of, 365, 366 ; geo-electric response 

 at, 367 ; additive action-current between tip and growing region, 370, 



371 



Sap, effect of variation of rate of ascent of : on growth, 52, 54, 55, 58 ; 



on torsion, 386, 433 

 Sijbaria Palm, diurnal movement of, 231 

 Sinapis, tropic response of root of, under unilateral light, 145 ; gradual 



transformation from positive to negative curvature under continuous 



illumination, 145, 146 

 Spasmodic death-contraction, in growing organs : under chloroform, 46 ; 



at critical fatal temperature, 37 ; reversal of direction of torsion at 



critical temperature, 390 

 Spectrum, effect of different rays of visible spectrum on growth, 78 

 Starch-sheath, geo-perceptive layer and, 341 ; duplication of, in Calendula, 



345 

 Statolithic theory of geotropic stimulation, 313 



Stimulants, effect of, on growth, 43 



Stimulation, identical reactions under diverse modes of, 62, 170, 422 ; 



retardation of growth under electric, 64 ; under photic, 72 ; under 



mechanical, 87; under radio- thermal, 178; under wireless, 189, 192 ; 



under geotropic, 284 

 Stimulation, laws of reaction under direct and indirect, 131, 170 ; dual 



impulses generated under, 124, 425 ; electric response to, 128 

 Stimulation, opposite effects of feeble and strong : on growth, 83, 187, 189, 



190, 423 ; on autonomous torsion, 395, 397 

 Strasburger, quoted, 216 

 Subtonic plant, acceleration or revival of growth under photic stimulation, 



84, 86 ; electric stimulation, 85 ; high-frequency alternating current, 



186, 1S7, 18S ; wireless stimulation, 191, 192 



