xiv SUMMARY OF CONTENTS 



CHAPTER III 

 Autonomous Movements 



Induced by internal stimuli, 528. 



1. Autonomous variation movements, 528. 



2. Autonomous growth movements, 529 ; circumnutation, 530 ; transitory and 



periodic nutation, 530; hyponasty and epinasty, 530; torsions and 

 twinings, 531. 



III. Locomotory Movements 

 CHAPTER I 

 Autonomous Locomotory Movements 



Occurrence and classification, 532. • 



1. Natatory movements, 532. 



2. Creeping movements, 534. Types of these: amoeboid movements, 534; 



rotation and circulation, 536. Causes of the movement, 536. 



3. Formal conditions, 539. 



CHAPTER II 

 Locomotory Directive Movements (Taxis) 



a. Taxis in free organisms, 541. 



1. Chemotaxis, 542 ; significance, 542 ; antherozoids of ferns, 542 ; other 



organisms, 544 ; strophic and apobatic reactions, 545 ; phenomena pre- 

 cedent to perception, 547. 



2. Osmotaxis, 547 ; hydrotaxis, 548 ; rheotaxis, 548. 



3. Thermotaxis, 548. 



4. Phototaxis, 548 ; positive and negative reactions, 549 ; light direction or 



Ught intensity, 549 ; apobatic phototaxis, 550. 



5. Galvanotaxis, 551. 



b. Taxis in protoplasm and its organs, 552. 



1. Phototaxis of chloroplasts, 552. 



2. Traumatotaxis of the nucleus of the cell, 553. 



INDEX 555 



