Xxiv LIST OF ILLUSTRATIONS 



FIG. PAGE 



32. Contractile response of a growing organ under electric shock 



(Crinum) ......... 69 



33. Effect of light in retardation of growth .... 72 



34. Determination of the latent period ..... 73 



35. Effect of light of increasing intensity in retardation of growth 74 



36. Effects of continuous electric and photic stimulation recorded 



on a moving plate (Crinum) ...... 75 



37. Direct and after-effect of light recorded by Method of Balance 



(Allium) ......... 76 



38. Response of subtonic specimen to stimulus of light . . 77 



39. Accleration of growth under subminimal stimulus of light 



(Kysoor) ......... 83 



40. Stimulus reviving growth at standstill (Allium) ... 84 



41. Electric stimulation enhancing rate of growth of subtonic 



plant (Wheat) ........ 85 



42. Effect of mechanical friction on growth . . . ,88 



43. Effect of pin-prick on growth ...... 88 



44. Diagrammatic representation of Method for the indirect and 



direct electric stimulation of tendril . . . .91 



45. Record by jMethod of Balance, showing acceleration of growth 



of tendril induced by electric stimulation (Cucurbita) . 91 



46. Variation of growth of tendril induced by direct electric 



stimulation ......... 92 



47. Positive curvature of tendril of Cucurbita under unilateral 



contact-stimulus ........ 94 



48. Diagrammatic representation of effect of indirect and direct 



unilateral stimulation of a tendril (Passiflora) ... 95 



49. Electric response at the distal and proximal sides of a tendril 



under unilateral mechanical stimulation (Vitis) . . 96 



50. The Phototropic Recorder for pulvinated organ and for grow- 



ing organ ......... 103 



51. Positive tropic effect of light on pulvinated organ . . .104 



52. Positive response of leaflets of Erythrina indica. (Para-helio- 



tropic response) . . . . . . . .104 



53. Positive phototropic curvature of a growing stem . . .105 



54. Latent period of response to light in a pulvinated organ . 106 



55. Effect of a single electric spark in causing variation of growth 108 



56. Tropic effect of increasing intensity of light, 1:2, on the 



positive up-response of terminal leaflet of Desmodium . 109 



57. Curve showing the relation between intensity of light and 



retardation of rate of growth (Crinum) . . . .110 



58. Tropic effect of increasing intensity of light, 1:2:3, on 



growing organ (Crinum) . . , .. . . .111 



59. Effect of increasing duration of exposure of i : 2 : 3 minutes 



on phototropic curvature of growing organ (Crinum) . .112 



60. The Collimator for application of light at various angles . 112 



61. Effect of angle of incidence of light on tropic curvature of 



pulvinus of Desmodium . . . . . .113 



62. Records of tropic curvature of growing bud of Crinum on 



alternate stimulation by light at 45° and at 90° . .113 



63. Longitudinal transmission of impulse in stem of Mirnosa . 119 



