CONTENTS 



CHAPTER I 



MOVEMENT 



PAGE 



I. The different forms of movement . . l 



2. The causes of movement 4 



3. The mechanism of movement . . I2 



CHAPTER II 



MOVEMENTS OF CURVATURE 



PART I. AUTONOMIC MOVEMENTS 



4. Occurrence and distribution 



5. The causes of autonomic movement . . . . . 2 5 



6. The influence of the external conditions 2 9 



7. The mechanics of autonomic movement / 3 1 



PART II. TWINERS AND CLIMBERS 



8. General ... 32 



9. The twining of stems . 



10. Twining plants (continued} ..... 3 



11. Tendril-climbers 42 



12. The special irritability of tendril-climbers 5 



13. The influence of contact upon the growth and curvature of tendrils . . . 57 



PART III. MOVEMENTS DUE TO MECHANICAL AND CHEMICAL STIMULI 



14. Irritability to contact and to mechanical shocks . . . 61 



15. (continued] 



16. Movements produced by mechanical stimuli .... 



17- >, (continued] ?8 



1 8. Movements produced by contact-stimulation . . . 



19. Curvatures produced by chemical stimuli .... 



20. The propagation of mechanical and chemical stimuli 9 1 



PART IV. PHOTONASTIC, THERMONASTIC, AND HYDRONASTIC CURVATURES 



21. General 



22. Instances of photonastic and diurnal movements 



23. The origin of the daily photonastic periodicity . . .108 



