374 RESEARCHES ON IRRITABILITY OF PLANTS 



Multiple response to strong stimulus in Biophytum, 284 

 ,, ,, under chemical stimulus, 286 



,, ,, ,, constant current, 249 



light, 286, 307 



Neptunia oleracea, latent period of, 120 



,, ,, polar effects of current on, 225 



,, ,) response of, 43 



Nitrogen dioxide, abolition of response by the action of, 95 



Periodic starter, 66 



Pfeffer on hydro-mechanical theory, 155 



Pfliiger on law of polar excitation in animal tissue, 232, 276 



Plant, on relative sensitiveness of animal and, 249 



Poison, block of conduction of excitation by local application of, 167 



„ abolition of pulsation in Desmodium by, 338 

 Polar action of currents, effect of tissue modification on, 266 

 ,, ,, ,, laws of, in plants, 233, 265 



„ ,, feeble currents, 216 



,, ,, moderate currents, 220 



,, ,, strong currents, 253 



Polar effects of ascending and descending currents, 203, 204, 206 

 ,, currents on Averrhoa bilimbi, 228 

 ,, ,, ,, Averrhoa carambola, 227, 262 



,, ,, ,, Biophytum, 223, 224, 262 



,, ,, ,, Desmodium, 236 



,, ,, ,, Mimosa, 217, 221, 229, 255, 256, 260 



,, ,, ,, Neptunia, 225, 226 



,, ,, ,, Protozoa, 199, 266, 276 



Positive response, characteristics of, 190 



,, ,, conditions favourable for, 187 



,, ,, electrical, 177 



,, ,, unmasking of, 195 



Potassium cyanide, abolition of rhythmic pulsation by the action of, 33 



,, ,, arrest of excitatory impulse by, 173 



Potential keyboard, 210 



,, slide, 208 

 Pulvinus of Mimosa, differential excitability in, 45 



Record, fixation of, 18 

 Recorder, optical lever, 178 



,, oscillating, 279 



,, resonant, 14 

 Response, different types of, 64 



,, effect of fatigue on, 72 



,, ,, ,, intensity of stimulus on, 61 



„ ,, ,, optimum condition on, 63 



