INDEX 199 
Stimulus, effect of different kinds of, 2 
Fr mechanical, by spring-tapper, 24 
i. a conditions for maintaining uniformity of, 26 
a 3 means of graduating intensity of, 22, 96 
oy vibrational, 24, 25, 26 
TEMPERATURE, death-points in plants, 61, 63 
“ effect of, on response in metal, 111 
” ” » in photo-sensitive cell, 158 
» 9 3 in plants, 382, 60-69 
” ” a in retina, 158 
“A 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 
ef, 17% 
Visual images, revival of, 177 
» impression, unconscious, 178 
» impulse, chemical theory of, 148 
; i 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 
53 on retinal response, 150, 156, 165 
5, On reversal of response in stale nerve and retina, 11, 124, 164 
ma on transformation from abnormal to normal response in nerve 
after continuous stimulation, 124 
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