123 



123 



I30 



LIST OF ILLUSTRATIONS XXV 



FIG. PAGE 



64. Records of effect of longitudinal transmission of impulse . 119 



65. Effect of transverse transmission of impulse under photic 



stimulation ......... 122 



66. Effect of transverse transmission of impulse under electric 



stimulation ......... 



67. Effect of transverse transmission of impulse under radio- 



thermal stimulation ....... 



68. Effect of indirect unilateral stimulation (Crinum) . .126 



69. Effect of indirect and direct electric stimulation on growth of 



Crinum ......... 127 



70. Effect of continuous indirect electric stimulation (Cosmos) . 128 



71. Diagrammatic representation of electromotive response to 



indirect stimulation of effectively increasing intensity . 129 



72. Positive, diphasic, and negative electric responses (Bryophyllum 



calycinum) ......... 129 



73. Electric response at distal and proximal sides under unilateral 



stimulation ......... 



74. Effect of electric shock of short duration in inducing contraction 



followed by normal recovery (Vigna Catjang) . . .136 



75. Effect of continuous electric stimulation showing fatigue- 



relaxation (Vigna Catjang) . . . . . .137 



76. Phototropic reversal under continued action of strong light 



(Vicia Faba) 138 



77. Positive, dia- and negative phototropic response of Oryza 



under continued unilateral stimulus of intense light . .138 



78. The Root-Recorder . . . . . . . .140 



79. Negative response of the root to indirect stimulation (Ipomoea) 141 



80. Negative response of shoot under indirect unilateral photic 



stimulation (Vicia Faba) . . . . . .142 



81. Effect of simultaneous unilateral stimulation of the tip and 



of the gro^Wng region of root (Ipomoea) . . . .143 



82. Effect on shoot and root of unilateral exposure to light 



(Sanchezia) . . . . . . . . .144 



83. Response of root of Sinapis under continued unilateral action 



of hght 146 



84. Simple characteristic curv^e of phototropic reaction . .150 



85. Complete phototropic curve of a pulvinated organ . . 154 



86. Complete phototropic curve of a growing organ (Zea Mays) . 155 



87. The incandescent electric lamp-holder .... 159 



88. Arc-lamp \\-ith totally reflecting prism for application of strong 



light vertically downwards or upwards . . . .160 



89. Records of effect of feeble light and of strong hght on upper 



half of pulvinus (Mimosa) ...... 160 



90. Effect of feeble and of strong light on lower half of pulvinus 



(Mimosa) 162 



91. Diagrammatic representation of the different layers in a 



longitudinal section of pulvinus . . . . .165 



92. Triphasic response on application of hght (Mimosa) . .166 



93. Parallel effect of radio-thermal stimulation . . . .166 



94. Effect of application of strong light on lower half of pulvinus. 166 



95. Response of leaflet of Averrhoa to strong light from above . 168 



