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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. Effect of weight on rapidity of fall 87 35. Stimulating action of Hydrogen peroxide 88 36. Incomplete recovery under the action of BaCl₂ and transient restoration under tetanisation 89 37. Antagonistic action of alkali and acid 90 38. Fatigue due to shortening of recovery-period 91 39. Effect of constant current in removal of fatigue 92 40. Stimulating action of light and depressing action of darkness 94 41. Action of glycerine in enhancing speed and intensity of transmitted excitation in Mimosa 102 42. Effect of injury in depressing conductivity in normal specimen 104 43. Effect of injury in enhancing conductivity in a subtonic specimen 105 44. Diagram of experimental arrangement for conductivity control in Averrhoa bilimbi 109 45. Diagram of complete experimental arrangement for conductivity control in Mimosa pudica 116 46. Record showing enhanced velocity in ‘up-hill’ and retarded velocity in ‘down-hill’ trans­mission 121 47. Direct and after-effect of hetero­dromous and homo­dromous currents 124 48. Diagram of experimental arrangement for variation of conductivity of animal nerve 126 49. Effect of hetero­dromous and homo­dromous current in inducing variation of conductivity in nerve 127 50. Record of ineffectively transmitted salt-tetanus becoming effective under hetero­dromous current 129 51. Direct and after-effect of homo­dromous current 131 52. Effect of indirect electric stimulus on the responding leaflet of Averrhoa 136 53. Staircase responses of sub-tonic specimen of Mimosa to electric shock 145 54. Staircase responses of sub-tonic specimen of Mimosa to light 147 55. Positive, diphasic, and negative responses of extremely sub-tonic specimen of Mimosa to successive light stimuli 147 56. The compound Lever 154 57.