4 1 i 



XVlll CONTENTS 



pag£ 



• — The Thermograph — Response of leaflet of Cassia alata — 

 Effect of variation of temperature — Effect of variation of hght — ■ 

 Diurnal movement of leaflet of Cassia — Diurnal movement of 

 terminal leaflet of Desmo£^a<m ^7m;?s ..... 207 



CHAPTER XX 



THERMONASTIC MOVEMENT OF NYMPHAEA 



Nastic and tropic movements — Positive thermonastic response of 

 Zephyranthes — Effect of variation of temperature — Responsive 

 movement under radiation — Diurnal movement of Nymphaea 



Effect of recurrent light and darkness — Ineffectiveness of 



geotropic stimulus — Thermonastic Recorder — The diurnal record 

 — Effect of rise and fall of temperature on thermonastic move- 

 ment—Two types of thermonastic movement, positive and 

 negative . . . . • • • • • .216 



CHAPTER XXI 



THE DIURNAL MOVEMENT OF THE ' PRAYING ' PALM 



The diurnal movement of the Faridpore Palm — ^Physiological cause 

 of the movement — The Automatic Recorder for the diurnal 

 movements of trees — -The diurnal record — The effect of light — 

 Effect of variation of temperature — Periodic Movement of the 

 Sijbaria Palm — Diurnal movement of Kentia Palm — The Diurnal 

 Indicator 224 



CHAPTER XXn 



DIURNAL MOVEMENTS OF PLANTS RENDERED 

 ANISOTROPIC BY^ GRAVITY^ 



Diurnal movement of procumbent stem of Mimosa — Records of 

 stem and leaf — Diurnal record of Tropaeolum under constant 

 temperature — Diurnal variation of tension and bulk in various 

 organs — Diurnal variation of tissue-tension in Mimosa — Effect 

 of reversal of induced anisotropy on diurnal movement — Analogy 

 with thermonastic phenomena — Effect of transpiration on 

 periodic movement — Persistence of diurnal movement of stem 

 and leaf after abolition of transpiration . . . . .236 



CHAPTER XXni 



PHOTOTROPIC TORSION 



Response by torsional movement — The Torsional Recorder — Effect 

 of lateral stimulation by light — Directive action of stimulus- 

 Effect of different modes of lateral stimulation — Effect of lateral 



