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112. Successive positive responses of the terminal leaflet of bean plant 317 113. Positive response and recovery under moderate phototropic stimulation 318 114. Persistent positive curvature under stronger stimulation 318 115. Immediate and after-effect of stimulus of light on growth 320 116. Latent period for photic stimulation 324 117. Effect of a single electric spark on growth 325 118. Responses of Mimosa leaf to light from above 330 119. Responses of Mimosa leaf to light from below 330 120. Record of effect of continuous application of light on upper half of pulvinus of Mimosa 331 121. Positive and negative phototropic response of Oryza 335 122. Leaf of Desmodium gyrans 339 123. The Oscillating Recorder 340 124. Tropic effect of increasing intensity of light on the leaflet of Desmodium gyrans 341 125. Tropic effect of increasing intensity of light on growing organ (Crinum) 341 126. The Collimator 342 127. Effect of angle of inclination of light on tropic curvature of pulvinated organ 343 128. Effect of angle of inclination on growth-curvature 343 129. Effect of increasing duration of exposure to light 344 130. Effect of continuous electric and photic stimulation on rate of growth 348 131. Characteristic curve of iron 351 132. Simple characteristic curve of phototropic reaction 351 133. Complete phototropic curve of pulvinated organ 358 134. Complete phototropic curve of growing organ 359 135. Arrangement for local application of light 367 136. Response of seedling of Setaria to light 368 137. Effect of application of light to the growing hypocotyl of Setaria 370 138. Response to direct and indirect photic stimulus 373 139. Diagrammatic