770 PLANT RESPONSE 



Erythrina indica, heliotropic response of, 629 



,, ,, polar effect of current on, 555 



EucJiaris Lily, cold-rigor in, 141, 172 

 Excitability, seasonal variation of, 80, 474 



variation of, by anaesthetics, 220 

 ,, by cold, 220 



,, by electrotonus, 234 



,, by fatigue, 221 



versus conductivity, 227 

 ,, receptivity, 226 

 Excitation, longitudinal conduction of, 516, 517, 526, 532, 604 

 ,, mechanical versus protoplasmic theory of, 189, 229 



,, transverse conduction of, 519, 528, 529, 532 



Excitatory contraction, physiological modification of, 79 

 ,, discharge, preferential direction of, 243 

 ,, versus hydrostatic effect, 35, 47 

 ,, wave, centrifugal velocity of, 243 

 ,, ,, centripetal velocity of, 243 



,, ,, determination of velocity of, by Chemical Method, 255 



,, ,, ,, ,, by Electromotive Method, 260 



,, ,, ,, ,, by Electrotactile Method, 25 



,, ,, ,, ,, by Mechanical Method, 240 



,, ,, modification of velocity of, by cold, 248 



„ „ „ by fatigue, 245 



,, ,, ,, ,, by intensity of stimulus, 246 



,, ,, ,, ,, by rise of temperature, 249 



,, ,, velocity of, in plant and animal, 252 



Fatigue, alternating, 106 



,, effect of, on conductivity and excitability, m 



,, ,, on electrical response, 105 



,, ,, on mechanical response, 105 



,, ,, on velocity of transmission, 244 



,, periodic, 65, 108 



, , reversal of normal polar effect by, 207 

 Fatigue-reversal under continuous stimulation, in arsenic, 119 



,, ,, ,, ,, in india-rubber, 120 



,, ,, ,, ,, in plant, 63, 107, 108, 109 



Fick on velocity of nervous impulse, 246 

 Firefly, glow-response of, 211 

 Flexibility, characteristic limits of, 646 

 Flowers, death-response of, 181 

 Food-substance, translocation of, 398 

 Forced vibration, 684 

 Frank on heliotropic response of Marchantia, 622 



,, on transverse heliotropism and geotropism, 641 

 Frost, effect on leaves, 400 



Galena, staircase response in, 121 

 Galvanotaxis, 698 



