i 9 4 RESPONSE IN THE LIVING AND NON-LIVING 



FATIGUE, absence of, under certain conditions, in metal, 120 

 in muscle, 39 



in plant, 39 



apparent, with increased frequency of stimulation, in metal, 120 

 ,, in muscle, 40 



in plant, 40 

 diminution of response under .strong stimulus due to, in plant, 57 



in metal, 118, 119, 185 

 ,, in muscle, 118, 185 

 in plant, 20, 185 

 due to overstrain, 41 



,, rapid, under continuous stimulation in metal, 121, 130 

 in muscle, 42, 130 



in plant, 42, 130 



,, removal of, by rest in plant, 43 

 theory of, in muscle, 38, 185 



HOLMGREN on retinal current, 149 

 Hysteresis, 137 



INJURY, current of, in nerve, 7 



Inorganic response. See Metal, electrical response in 



KUHNE on retinal current, 149 



Kunkel on electrical changes by injury or flexion in plant, 14, 70 



LIGHT, after-effect of short exposure to, on photo-sensitive cell, 171 

 ,, on retina, 171 



decline and reversal of response under continuous, in photo- 

 sensitive cell, 166 

 continuous, in retina 



166 

 ,, effect of temperature on response of photo-sensitive cell produced 



by, 158 



,, ,, ,, retinal response produced by, 158 



relation between intensity and response to, in photo-sensitive cell, 



161, 162 



in retina, 162 



response to, after- oscillation in photo-sensitive cell, 159, 163 

 effect of increasing length of exposure in photo-sensi- 



tive cell, 159 

 ?> ,, in retina, 160 



in frog's retina, 150, 151, 156, 164, 166 



in photo-sensitive cell, 152, 153, 154, 155, 157, 165, 166 



