CONTENTS. XIX 



PAGE 



Thermotropism 394 



Assumption of Definite Form during Growtli 394 



Amount of Force exerted during Growth 395 



CHAPTER XIII. 



MOVEMENTS. 



Locomotion . 397 



Movements of Chlorophyll Granules in Leaves 398 



Hygroscopic Movements 399 



Movements due to Changes in Structure during Ripening of Fruits . 400 



Revolving Movements, or Cireumnutation . , . 400 



Methods of Observation 401 



In Seedlings 403 



Of the Young Parts of Mature Plants 405 



In Twining Plants 405 



Modified Cireumnutation 407 



iNvctitropic or Sleep Movements ... . 409 



Of Cotyledons 411 



Of Floral Organs 412 



Times of Opening and Closing of Flowers . 412 



Spontaneous or Autonomic Movements 413 



Telegraph Plant 413 



Cause of Autonomic Movements not fully known . 414 



Sensitiveness 



Of Roots *1^ 



Of Stems and Branches ^^^ 



Of Tendrils ^^'^ 



OfPetioles *^^ 



Of Leaf-blades ^^^ 



Of Sensitive Plant *20 



Of Stamens *^^ 



Effects of Anaesthetics upon Sensitiveness 424 



CHAPTER XrV. 



REPRODUCTION. 



Individuality in Plants . . 



Methods of Reproduction . . . . 



Fertilization in Angiosperms 



The Pistil 



The Stigmatic Secretion . . , 



The Pollen-grain 



Structure 



425 



426 

 426 

 427 

 427 

 427 

 428 



Contents ^^ 



