XXXVlii COMPARATIVE ELECTRO-PHYSIOLOGY 



FIG. PAGE 



254. Similar effect in response of retina of Ophiocephalus -fish . , , 427 



255. The same with another specimen. Light was here cut off after the 



first oscillation . .. .... .. ... ... ... , . 427 



256. Response of retina of Ophiocephahis when slightly fatigued . _ . 428 



257. Response of frog's eye (Kiihne and Steiner) . Z .'*''. ~ . . . . 428 



258. After-effect of Light on Silver Bromide , I ; ' v^i "~-l * } '. . 429 



259. Response of petiole of cauliflower. Light was here cut off on attain- 



ment of maximum negativity -.'..; ' -.'.-* *"--' j; ^';v":' i ';-'.- . 430 



260. Response of retina of Ophiocephalus fish when depressed . . . 430 



261. Response of isolated retina offish as observed by Kiihne and Steiner 430 



262. Inclined Slits for Stereoscope .and Composite Image formed in the 



Two Eyes . . . . ; ;-> V.-: ;^ . J . '. . ^ :,'J . . : *.-;... .'.. 432 



263. Composite .Indecipherable Word, of which Components are Seen 



Clearly on Shutting the Eyes I-l^&.i.rJ'j ...,.''. ' '.'.'; . .:... .." 432 



264. Diagrammatic Representation of a Multicellular Organ laid Horizon- 



tally and Exposed to Geotropic Stimulus ; . .. :;^...i - - >, .< .. 435 



265. Effect on Apogeotropic Movement of.Temporary Application of Cold 



on Upper and Lower Surfaces respectively . '. I ;" ''... . ,. . 436 



266. Diagrammatic Representation of Experiment showing Curvature 



. Induced by Unilateral Pressure Exerted by Particles . v... "- . 437 



267. Record of Responsive Curvature Induced in Bud of Crinum Lily by 



Unilateral Pressure of Particles . :-JrI.V. . . r . : - V '' . . 437 



268. Record of Apogeotropic Response in Scape of Uriclis Lily . . 438 



269. Photographic Record of Geo-electric Response in the Scape ^ of 



Uriclis Lily laid horizontally. 1 v* :._': -... ;,:;:,'*... % ,..->"v-' 440 

 270.. Experimental Arrangeient . for -Subjecting, Organ to Geotropic 



Stimulus, Mechanical Response being Restrained ;;. _.; ; ,..:'.*, 441 

 27.1. Geo-electric Response of the Physically Restrained Scape of Uriclis 



Lily . , -..::. +L -!. ' , . .. . _ . ... . . " .: 442 



272. Diagrammatic Representation of . Electrical -Connections for Deter- 



mination of Velocities of Centrifugal and Centripetal Trans- 

 missions . : - . o I- :.*-;-': _ .-* ,1.U - ^,V :-!. .;:.;_. &...'. . 447 



273. Experimental Arrangement for Comparing the Relative Conduc- 



tivities in Transverse and Longitudinal Directions -. . " h, ...^J. 454 



274. Response of Frog's Nerve under Simultaneous Excitation of both 



Contacts, by Equi-alternating Electrical Shocks, one Contact 

 being Injured -. -. ...._:.../_ ." . ..-. ,,*.L, _;' . ,^'. ,' . 457 



275. Enhancement of Amplitude of Response, as After-effect of Thermal: .&;$ 



Tetanisation, in Frog's Nerve .. -^ ,_.!...;. .^ .1 i; ^ . . 462 



276. Conversion of Abnormal Positive into Normal Negative Response 



after Thermal Tetanisation ;I . ^..' :.. ^-'.-. I ...-.>./.; ._ .. . 463 



277. Gradual Transition from Abnormal Positive, - through Diphasic, to 



Normal Negative Responses in Frog's Nerve '- -.--'^ -- : ---- . 464 



278. Abnormal Positive Response converted through Diphasic to Normal 



Negative under the increasingly Effective Intensity of Stimulus, 

 brought about by Lessening the Distance between the Responding 

 and Stimulated Points . . j . .i Xr'- 7 -'----- t -- ' '' ' ---w^* 466 



279. Frond of Fern with Conducting Nerves exposed. . . . . ... ._ .i . 469 



