| FIGURE. | PAGE. |
| 1. | Photographs of morning and evening positions of the ‘Praying Palm’ | 7 |
| 2. | The Recording Apparatus | 9 |
| 3. | Record of diurnal movement of the ‘Praying Palm’ | 11 |
| 4. | ??"?????"??????"??Sijbaria Palm | 12 |
| 5. | Curve of variation of moto-excitability in Mimosa pudica | 17 |
| 6. | Effect of physiological depression on diurnal movement of Arenga saccharifera | 19 |
| 7. | Record of diurnal movements of young procumbent stem of Mimosa pudica | 26 |
| 8. | Erectile response of Basella to gradual fall of temperature | 28 |
| 9. | Responsive fall of Basella to gradual rise of temperature | " |
| 10. | Response of a straight tendril of Passiflora | 33 |
| 11. | Response of a hooked tendril of Passiflora | 35 |
| 12. | Response of pulvinus of Mimosa pudica | 36 |
| 13. | ??"?????"???Mimosa to variations of turgor | 40 |
| 14. | Diagram of complete apparatus for record of diurnal variation | 46 |
| 15. | The Oscillator | 50 |
| 16. | Effect of cloud on excitability of Mimosa | 52 |
| 17. | Effect of sudden darkness | 53 |
| 18. | Effect of change from darkness to light | 54 |
| 19. | Effect of enhanced turgor | 55 |
| 20. | Effect of moderate cooling | 56 |
| 21. | Effect of application of intense cold | 58 |
| 22. | Effect of temperature above the optimum | 58 |
| 23. | Twenty-four hours’ record of excitability of Mimosa | 59 |
| 24. | Midday record from noon to 3 P.M. | 62 |
| 25. | Evening record from 6 to 10 P.M. | 63 |
| 26. | Morning record from 8 A.M. to 12 noon | 64 |
| 27. | Diurnal variation of excitability showing marked nyctitropic movement | 65 |
| 28. | Diurnal curves of temperature and of corresponding variation of excitability of Mimosa | 68 |
| 29. | Diurnal variation of excitability of a summer specimen | 70 |
| 30. | The Resonant Recorder | 76 |
| 31. | Variation of excitability after section | 80 |
| 32. | Effect of amputation of upper half of pulvinus of Mimosa | 84 |
| 33. | Response of Mimosa after amputation of lower half of pulvinus | 86 |
| 34. |
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