CONTENTS 



CHAPTER I 



MOVEMENT 



PAGE 



I. The different forms of movement I 



2. The causes of movement 4 



3. The mechanism of movement . . . . , 12 



CHAPTER II 



MOVEMENTS OF CURVATURE 



PART I. AUTONOMIC MOVEMENTS 



4. Occurrence and distribution 19 



5. The causes of autonomic movement 25 



6. The influence of the external conditions 29 



7. The mechanics of autonomic movement 3 1 



PART II. TWINERS AND CLIMBERS 



8. General 32 



9. The twining of stems 34 



10. Twining plants (continued] 38 



11. Tendril-climbers 42 



12. The special irritability of tendril-climbers S 



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 



IS- ,, (continued} .... 67 



16. Movements produced by mechanical stimuli 71 



I7 >, ,, (continued] 78 



1 8. Movements produced by contact-stimulation 82 



19. Curvatures produced by chemical stimuli 85 



20. The propagation of mechanical and chemical stimuli 91 



PART IV. PHOTONASTIC, THERMONASTIC, AND HYDRONASTIC CURVATURES 



21. General 97 



22. Instances of photonastic and diurnal movements 101 



23. The origin of the daily photonastic periodicity 108 



