INDEX 199 



Stimulus, effect of different kinds of, 2 



,, mechanical, by spring-tapper, 24 



,, ,, conditions for maintaining uniformity of, 26 



,, means of graduating intensity of, 22, 96 



vibrational, 24, 25, 26 



TEMPERATURE, death-points in plants, 61, 63 



,, effect of, on response in metal, 111 



in photo-sensitive cell, 158 



in plants, 32, 60-69 



,, ,, ,, in retina, 158 



increased sensitiveness in plant due to variation of, 66, 67 



VIBRATIONAL stimulus, 24, 25. 26 

 Vision, binocular alternation of, 175 



,, effect of various conditions on the period of binocular alternation 



of, 177 

 Visual images, revival of, 177 



,, impression, unconscious, 178 



,, impulse, chemical theory of, 148 



,, ,, electrical theory of, 149 



,, phantoms, 179 



,, recurrence, 174 

 Vital force, 13 

 Vitalism, 182 



WALLER on enhancement of nerve-response after continuous stimulation, 127 

 on relation between stimulus and response in muscle, nerve, and 



retina, 52, 162 



,, on retinal response, 150, 156, 165 



,, on reversal of response in stale nerve and retina, 11, 124, 164 

 on transformation from abnormal to normal response in nerve 

 after continuous stimulation, 124 



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