ILLUSTRATIONS xxi 



77. Constancy of latent period under stimuli above the maximal 



78, 79. Effect of fatigue ....... 



80, 81. Effect of temperature ...... 



82. Determination of velocity of transmission of excitation in 

 Mimosa ........ 



83, 84. Determination of velocity by Differential Method . 139, 140 



85 



Effect of intensity of stimulus on velocity and after-effect 



Effect of optimum condition on velocity 



Effect of fatigue on velocity of transmission . 



Effect of temperature on velocity .... 



Record giving transmission time in Biophytum 



90. Effect of cold in the retardation and arrest of transmission 



91. Arrangement for electrotonic block .... 



92. Record of effect of electrotonic block .... 



93. Records of transmitted excitation with the block off and on 



94. Effect of CuS0 4 in abolishing conduction 



95. Abolition of conductivity by'KCN . ... 



96. Positive response followed by negative in Biophytum under 



indirect thermal stimulus ..... 



97. Diphasic response in Biophytum under indirect chemical 



stimulation ....... 



98,99. Positive followed by negative in A verrhoa . 



100. Diphasic response in Mimosa due to indirect electric stimu 



lation of petiole ....... 



101. Diphasic response in Mimosa due to indirect thermal stimu 



lation of stem ....... 



102. Effect of intensity of stimulus in modifying the diphasic response 187 



103. Effect of diminishing distance in transforming positive into 



diphasic response in Biophytum . . . . .189 



104. Effect of diminishing distance on the response in Mimosa . 194 



105. Masking of the positive by the predominant negative . .194 



106. Pohl's commutator ........ 200 



107. Record of polar excitation under feeble current . . . 202 



108. Excitation by ascending and descending current . . . 204 



109. Records of responses to ascending and descending current 



in Mimosa ......... 205 



no. Records of responses to ascending and descending induction- 

 shock ......... 206 



in. The Potential Slide 208 



112. The Potential Keyboard . . . . . . .210 



113. The electrode holder . . . . . . . .217 



114. Excitation induced in Biophytum by the make of kathode and 



break of anode ........ 224 



127 

 128 

 130 



137 



143 



145 

 147 

 149 



151 

 162 



165 

 166 

 167 

 172 

 173 



180 



182 

 184 



186 



