xviii COMPARATIVE ELECTRO-PHYSIOLOGY 



PAGE 



Autonomous mechanical response of Desmodium gyrans and its time- 

 relations Simultaneous mechanical and electrical records of automatic 

 pulsations in Desmodium Double electrical pulsation, principal and 

 subsidiary waves Electrical pulsation of Desmodium leaflet under 

 physical restraint Growth-pulsation So-called current of rest in grow- 

 ing plants . . . : v ; . . ^ - . : A. ;< ; ^. ' . . 207 



CHAPTER XVIII 



RESPONSE OF LEAVES 



Observations of Burdon Sanderson on leaf-response in Dionaa Leaf and 

 stalk currents Their opposite variations under stimulus Similar leaf- 

 and-stalk currents shown to exist in ordinary leaf of Ficus religiosa 

 Opposite- directioned currents in Citrus decttmana True explanation of 

 these resting-currents and their variations Electrical effect of section 

 of petiole on DionaavoA Ficus religiosa Fundamental experiment of 

 Burdon Sanderson on lamina of Dionaa Subsequent results Experi- 

 mental arrangement with symmetrical contacts Parallel experiments on 

 sheathing leaf of Musa Explanation of various results , : :'* '' . 223 



CHAPTER XIX 



THE LEAF CONSIDERED AS AN ELECTRIC ORGAN 



Electrical organs in fishes Typical instances, Torpedo and Malepterurus 

 Vegetal analogues, leaf of Pterospermum and carpel of Dillenia indica 

 or pitcher of Nepenthe Electrical response to transmitted excitation 

 Response to direct excitation Uni-directioned response to homo- 

 dromous and heterodromous shocks Definite-directioned response 

 shown to be due to differential excitability Response to equi-alternating 

 electrical shocks Rheotomic observations Multiple excitations 

 Multiplication of terminal electromotive effect, by pile-like arrangement, 

 in bulb of Uriclis lily . . .. ; .: ..<,;. . -. . 241 



CHAPTER XX 



THE THEORY OF ELECTRICAL ORGANS 



Existing theories Their inadequacy The ' blaze -current ' so called Re- 

 sponse uni-directioned, to shocks homodromous or heterodromous, 

 characteristic of electric organs Similar results with inorganic specimens 

 Uni-directioned response due to differential excitability Electrical 

 response of pulvinus of Mimosa to equi-alternating electric shocks Re- 

 sponse of petiole of Musa Of plagiotropic stem of Cucurbit a Of Eel 

 The organ-current of electric fishes Multiple responses of electrical 

 organ Multiple responses of Biof kyium . . ... . i . 259 



