1. The effect of wound or section in modification of normal excitability.
2. The change of excitability after immersion in water.
3. Quantitative determination of the rate of decay of excitability in an isolated preparation.
4. Effect of amputation of the upper half of pulvinus.
5. Effect of removal of the lower half.
6. Influence of the weight of leaf on rapidity of responsive fall.
7. The action of chemical agents.
8. Effect of “fatigue” on response.
9. The influence of constant electric current on recovery.
10. The action of light and darkness on excitability.