52. Effect of indirect electric stimulus on the responding leaflet of _Averrhoa_ 136 53. Staircase responses of sub-tonic specimen of _Mimosa_ to electric shock 145 54. Staircase responses of sub-tonic specimen of _Mimosa_ to light 147 55. Positive, diphasic, and negative responses of extremely sub-tonic specimen of _Mimosa_ to successive light stimuli 147 56. The compound Lever 154 57. The crank arrangement for oscillation 156 58. Photograph of the High Magnification Crescograph 157 59. Crescographic record of absolute rate of growth of _Kysoor_, and of effects of cold and warmth on stationary and moving plates 161 60. Record of physical change 164 61. Records of latent period and time relations of growth response 165 62. Record of a single growth-pulse of _Zephyranthes_ 167 63. Records of growth-rate at different temperatures 175 64. Continuous record of growth, showing temperature minimum 178 65. Continuous record of growth, showing temperature maximum " 66. The Thermo-Crescent Curve 180 67. Curve showing the relation between growth and temperature 181 68. Effects of H_{2}O_{2}, NH_{3}, and ether on growth 184 69. Effect of CO_{2} on growth 185 70. Effect of irrigation on growth 189 71. Effect of plasmolysis on growth 191 72. Effect of increasing intensity of electric stimulus on growth 196 73. Effect of continuous electric stimulation on growth 197 74. Immediate and after-effects of friction, and of wound on growth 200 75. Normal retarding effect of light on growth 206 76. Record showing latent period of growth in response to light 207 77. Effect of light of increasing intensities 208 78. Continuous effect of light and of electric stimulus on growth 209 79. Effects of different rays of the spectrum on growth 210 80. Photographic records of positive, diphasic and negative electric responses of petiole of _Musa_ 214 81. Record of growth variation of _Crinum_ under Direct and Indirect stimulus 216