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 Biophyttim . . . . . . . . . 61 



31. 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 Desmoditim 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 . . . . . . . . . ..in 



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. 2 CO 3 solution on current of rest . . . . . 122 



59. Effect of CO.; on current of rest . . . . . . .122 



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



