ILLUSTRATIONS xxxv 



FIG. PAGE * 



174. Photographic Record of Responses of Plagiotropic Stem of Cucurbita 



to Equi-alternating Electric Shocks . . . . - 285 



175. Electrical Responses of Eel to Equi-alternating Electrical Shocks . 285 



176. Rotary Mechanical Stimulator . . . . . . 291 



177. Diagram Representing Different Levels of Excitability, Plus, Zero, 



and Minus . . - . . . . ' . . . 296 



178. Electrical Response of Grape-skin to Rotary Mechanical Stimulation 299 



179. Electrical Response of Frog's Skin to Rotary Mechanical Stimulation 300 



1 80. Photographic Record of Electrical Responses of Upper Surface of 



, Intact Human Forefinger to Rotary Mechanical Stimulation . 301 



181. Photographic Record of Electrical Responses of Grape-skin to 



. Thermal Shocks . . . . . . - . .. . .. . 301 



182. Photographic Record of Electrical Responses of Grape-skin to Stimu- 



lation by Equi-alternating Electrical Shocks . . :' . ... . 302 



183. Photographic Record of Series of Electrical Responses of Frog's Skin 



to Equi-alternating Electrical Shocks . . . . . . . 302 



184. Photographic Record of Transverse Response of Pulvinus of Mimosa 



, to Equi-alternating Electrical Shocks ..." . ...... . . . 303 



185. Continuous Photographic Record of Autonomous Pulsation of Des- 



modiuui gyrans from 6 P.M. to 6 A.M. . . . - . . . 305 



1 86. Photographic Record of Electrical Responses in Skin of Neck of 



Tortoise to Stimulus of Equi-alternating Electrical Shocks '._ . 306 



187. Isolated Responses of Upper and Lower Surfaces of Skin of Tomato 



. to Rotary Mechanical Stimulus . . . . . . . 307 



1 88. Photographic Record of Series of Responses in Skin of Tomato under 



Equi-alternatin Electrical Shocks . . . . 308 



189. A Single Response of Skin of Tomato to Equi-alternating Shock 



recorded on Faster Moving Drum . . . . ... 309 



190. Photographic Record of Series of Normal Responses in Skin of 



Gecko . . . ... . . . . .310 



191. Photographic Record of Abnormal Diphasic Responses in Skin of 



Gecko, converted to Normal, after Tetanisation . . . ; ' 311 



192. Transverse Section of Tissue of Hollow Peduncle of Uriclis Lily . 313 



193. Photographic Record of Responses of Water-melort to Equi-alter- 



nating Electric Shocks . . - . . - . - . - ... 315 



194. Photographic Rec d of Electrical Responses of Intact Human 



Armpit . . . . . . . - , 319 



195. Experimental Arrangement for Response of Human Lip . . . 320 



196. Photographic Record of Electrical Response of Intact Human Lip . 321 



197. Possible Variations of Responsive Current, as between Two Surfaces 



A and B, shown by Means of Diagrammatic Representations of 



Characteristic Curves . . . . . . - . . 324 



198.; Photographic Record showing Reversal of Normal Response in 



Pulvinus of Mimosa due to Fatigue . . . . .;--') . 326 

 199., Photographic Record showing Reversal of Response in Carpel of 



Dillenia indica, under Sub-minimal Stimulation . . -. * . 328 



200. Pitcher of Nepenthe, with lid removed . . . . . . 335 



20 1 . Glandular Surface of a Portion of the Living Membrane ofHhe Pitcher 



- . of Nepenthe . . -. - . , -.---., - . . . 336 



