ILLUSTRATIONS XXXVii 



FIG. PAGE 



231. Photographic Record of Effect of Stimulus on Over-balance . . 386 



232. Photographic Record of Response to Continuous Sub-terminal Stimu- 



lation 388 



233. Experimental Arrangement for Detection of Electrical Change 



induced at the Point transversely Distal to Point stimulated . . 397 



234. Record of Response to Moderate Unilateral Stimulation under the 



Experimental Arrangement described . . . . . . 398 



235. Record of Different Specimen under same Experimental Arrange- 



ment when Stimulus is first Moderate and then Increased . . 399 



236. Mechanical Response of Pulvinus of Mimosa to Continuous Action 



of Light from Above ......... 400 



237. Electrical Response in the Lower Half of the Pulvinus of Mimosa 



due to Stimulation of Distal Upper Half by Light . . . 401 



238. Photographic Record of Series of Negative Responses of Petiole of 



Bryophyllum to Stimuli of Sunlight ...... 402 



239. Record of Responsive Growth-variation taken under condition of 



balance in slightly Sub-tonic Flower-bud of Crinum Lily under 

 Diffuse Stimulation of Light . . . f . . . -405 



240. Photographic Record of Positive Response of the Petiole of Cauli- 



flower to Light .......... 406 



241. Multiple Mechanical Response of Leaflet of Biophytum under the 



Continuous Action of Light ....... 407 



242. Photographic Record of Multiple Electrical Response in Leaf of 



Bryophyllum under Continuous Action of Light . . . . 408 



243. Diagrammatic Representation of Phasic Alternations, and After-effect 



in Type 1 409 



244. Photographic Record of Phasic Alternations, showing Direct and 



After Effects of Light in Type I., represented by Bryophyllum . 411 



245. Diagrammatic Representation of Phasic Alternations, and After 



Effect in Type III. ......... 412 



246. Photographic Record of Phasic Alternation, showing Direct and 



After Effects in Type III., represented by Petiole of Cauli- 

 flower ............ 413 



247. Photographic Record of Pair of Responses obtained with a Second 



Specimen of Cauliflower, representative of Type III. . . . 413 



248. Experimental Arrangement for Determination of Differential Excita- 



bility of Optic Nerve and Cornea . . . . . ... 417 



249. Series of Photographic Records of Excitatory Responses in Frog's 



Eye to Equi-alternating Electric Shocks . . . ... 417 



250. Experimental Arrangement for Demonstration of Differential Excita- 



bility as between Retina and Optic Nerve 418 



251. Series of Photographic Records of Excitatory Responses in Frog's 



Retina to Equi-alternating Electric Shocks 419 



252. Photographic Record of Multiple Response of Retina of Frog under 



Continuous Action of Light ....... 426 



253. Response of petiole of Bryophyllum. Light was cut off on attain- 



ment of maximum positivity in the second of the multiple 

 responses . . V . 427 



