736 COMPARATIVE ELECTRO-PHYSIOLOGY 



POSITIVE AND NEGATIVE RESPONSE 



PAGE 



27. Hydraulic response in Mimosa . . . . . ., . 55 



28. Positive mechanical response followed by negative in Biophytum . . 58 



29. Positive mechanical response followed by negative in Mimosa . . 59 



30. Simultaneous record of positive and negative mechanical and electrical 



response in Biophytum . . . . . . . 61 



3 1 . Positive, diphasic and negative response in petiole of cauliflower . 62 



32. Positive and negative responses in tuber of potato . . 64 



33. Unmasking of positive element in response by selective block . . 66 



34. Effect of stimulus of light on growth . . . . , 73 



35. Effects of steady and sudden variation of temperature on growth 



response ........... 74 



VARIOUS TYPES OF RESPONSE 



36. Abnormal positive response in sub-tonic tissue 83 



37. Staircase response in tissue originally sluggish . . . 91 



38. Staircase response in vegetal nerve . . . . . . . 91 



39. Staircase response in galena . . . . . . . .103 



40. Uniform response in plant . . . . . . 92 



41. Fatigue due to rapidly succeeding stimulation ..... 93 



42. Fatigue due to overstrain 96 



43. Fatigue-decline under continuous stimulation, in mechanical response 



of Mimosa ........... 95 



44. Fatigue-decline under continuous stimulation, in electrical response 



of celery ........... 95 



45. Oscillatory response in arsenic . . . . . . .98 



46. Phasic alternation in mechanical response of style of Datura . . 100 



47. Periodic fatigue in electric response of plants ..... 98 



48. Periodic fatigue in autonomous response of Desmodiitm gyrans . . 99 



49. Reversal of normal response in fatigued nerve . . . . .102 



50. Bifurcated expression of response as growth and mechanical response 104 



DETECTION OF PHYSIOLOGICAL ANISOTROPY 



51. Differential response of compound strip . . . . . .108 



52. Isolated responses of upper and lower halves of pulvinus of Mimosa, 



with resultant differential response . . . . . . . 109 



53. Transverse differential electrical response of pulvinus of Mimosa . 1 10 



54. Transverse differential electrical response of plagiotropic stem of 



Cucurbita . . . . . . . . . ..ill 



55. Transverse differential electrical response of petiole of Musa . .114 



NATURAL CURRENT OF REST AND ITS VARIATIONS 



56. Effect of rise of temperature on current of rest . . . 119 



57. Effect of falling temperature on current of rest . . . .119 



58. Effect of Na^COg solution on current of rest . . . . . 122 



59. Effect of CO 2 on current of rest 122 



60. Reversal of natural current of rest as after-effect of stimulation . . 127 



