372 RESEARCHES ON IRRITABILITY OF PLANTS 



Dual impulses in Mimosa, 185 

 Duplex recorder, 69 



Electric current, polar effects of, in excitation, 198 



„ „ multiple excitation induced in Biophytum by, 249 



„ response, detection of excitation by, 98 

 „ „ „ „ excitatory wave by, 133 



„ ,, determination of death-point by, 105 



,, „ multiple, 283 



Electro- thermic stimulator, 25 



Electro-tonic block, arrest of excitatory impulse by, 164, 238 

 Electrotonus, modification of excitability by, 164 

 Energy, effect of run-down of, on rhythmic pulsation, 313 



„ storage of, from external stimulus, 287 

 Ether, effect of, on Desmodium pulsation, 336 



„ „ „ Mimosa, 92 



Excitability, diurnal variation of, 46 



„ effect of temperature on, 60 



„ electro-tonic variation of, 238 



„ variation of, by chemical agents, S$ 



Excitatory impulse, arrest of, by action of poison, 167 

 „ „ „ „ cold, 161 



„ „ „ „ electrotonic block, 164 



„ ,, determination of velocity of, 135 



„ „ effect of fatigue on, 147 



„ ,, ,, ,, intensity of stimulation, 142 



„ ,, ,, ,, temperature, 148 



„ „ versus hydro-mechanical, 155 



Exciter, automatic, 66 



Fatigue, alternating, 80 



„ effect of, on death point, 106 



„ „ „ „ latent period, 128 



,, ,, ,, ,, response of Mimosa, 72 



„ „ „ ,, velocity of transmission of excitation, 147 



„ reversal, under continuous stimulation in plant and animal, 81 



Friction, errors in record introduced by, 9 



Haberlandt on theory of mechanical transmission, 155 



Hydro-mechanical theory, 154 



Hydrostatic pressure, effect on Desmodium pulsation, 300 



Intermittent contact, advantage of, in record, 21 

 Inversion, thermo-mechanical, 104 



Kathode, depression of excitability at break of, 242 

 „ diastolic expansion by break of, 237 

 „ excitatory effect of, at make, 201 



„ reduction of diastolic expansion in Desmodium by make of, 236 

 „ systolic arrest by make of, 237 



