CONTENTS. Xlll 



PAGE 



Effect of Removal of Root-tip 227 



Apogeotropism ; Region of Geotropic Curvature in Stem ; 



Apogeotropism of Grass Nodes ; Measurement of Curvature ; 



After-effect 228 



Diageotropism and Exotropism of Rootlets ; Diageotropism of 



Stem Branches and of Leaves 230 



Diageotropism and other Orientation Movements in Flowers ... 231 

 Clinostat Experiments ; Elimination of Phototropism and 



Geotropism ; Rectipetality ; Reaction Time and Presentation 



Time 232 



Hydrotropism of Roots 235 



Experiments with Twining Stems ; Material for Study ... ... 236 



Revolving Movement of Stem Tip ; Influence of Temperature 



and of Light Direction on Rate of Revolution ... ... 237 



Revolution causes Twisting of Stem ; Tightening of Coils 



around the Support ; Free Coiling of Stem Tip ... ... 238 



Influence of Thickness of Support ; Change from Thick to Thin 



Support ; Inclined and Horizontal Supports ; Smooth and 



Rough Supports 239 



Effect of Inversion of Plant on already-formed Coils ; Persistence 



of Torsion after Disappearance of Coils ; Behaviour of 



Twiners on the Clinostat 240 



Experiments with Tendrils ; Thigmotropism ; Haptotropism ; 



Material for Experiments with Tendrils ... ... ... 241 



Growth of Tendrils before Contact ; Localisation of Respon- 

 siveness ; Response to Stimulation ; Distinction between 



Sensitiveness and Responsiveness ... ... ... ... 242 



Tendrils respond only to Stimulation by Solids; Tendrils are 



irresponsive to Stimulation by Gelatine ... ... ... 243 



Growth on Upper and Lower Sides of Tendril ... ... ... ^44 



How the Tendril clasps its support ; Changes in Tendril after 



Attachment : 244 



Tendrils with Sticky Pads ; Tendrils with Hooks 245 



Experiments with Mimosa ; Day and Night Positions of the 



Leaves ; Effect of General Mechanical Stimulation ; 



Sensitiveness of Lower Side of Pulvinus ... ... ... 246 



Effects of Repeated Stimuli, of Heat, of Irritant Vapours, of 



Anaesthetics, and of Continued Darkness 248 



Mechanism of Movement in Mimosa ... ... ... ... 249 



