INDEX 447 



Transverse transmission of impulse : under photic stimulation, 121, 134 ; 

 under electric stimulation, 121, 122 ; under radio-thermal stimula- 

 tion, 123 



Trees, recorder for diurnal movements of, 227 



Tropaeolum, effect of ether vapour and chloroform on growth of, 44, 46 ; 

 diurnal movement of procumbent stem, 238; constant temperature 

 on diurnal movement, 239; geotropic response of, 286, 294; under 

 chloroform, 296 ; under ether, 297 ; under carbon dioxide, 299 ; 

 geo-electric response at different angles of inclination, 350-3, 355 ; 

 critical angle for geotropic excitation, 361, 362 



Tuberose, geotropic response of , 285 ; effect of carbon dioxide on geotropic 

 response of, 302 



Tulipa, Pfeffer on thermonasty of, 217 



Twining, mechanism of : in tendril, 97 ; in stem, 373, 381, 382, 393 ; 

 effect of unilateral stimulation by light on torsion of stem, 412, 435 



ViciA Faba, revival of growth on irrigation, 52 ; gradual transformation 

 of positive into negative phototropic curvature, 138 ; effect of longi- 

 tudinal transmission of impulse under unilateral stimulation, 177; 

 geo-electric response of root-tip, 367, 369 



Vigna Catjang, contractile response and recovery after brief stimulation, 

 135 ; fatigue-relaxation after prolonged stimulation, 136 



Water-Lily, diurnal record of thermonastic movement in, 221, 222 

 Wheat, effect of ether vapour on growth of, 44 ; acceleration of growth 



in subtonic plant under electric stimulation, 85 ; effect of light from 



a single spark on growth, 107 ; of high-frequency alternating current 



on growth, 186, 187 

 Wireless stimulation, response of plants to feeble and strong intensity of, 



189-194, 424 

 Wound, effect of, on growth, 89 



Zea Mays, complete phototropic curve of, 154 ; effect of wireless stimu- 

 lation on growth of, 193 



Zenithotropism, 290 



Zephyranthes sulphurea, pulsation of growth in, 18; effect of alternate 

 supply and withdrawal of water on growth of, 55 ; of mechanical 

 stimulation and wound on growth, 87, 89 ; positive thermonastic 

 response of, 217, 223 



Printed in England at The Ballantyne Press 



Spottiswoode, Ballantyne & Co. Ltd. 



Colchester, London & Eton 



