The Characteristic of Nerve. 



221 



reason of some muscular contraction. In the case of the eye it was 

 often difficult to tell whether the smallest " something felt " were a 

 slight common sensation or a slight phosphene. 



In the case of the eye this point, however, came out with satisfactory 

 distinctness, viz., that low in the energy series, i.e., with longer stimuli 

 by lower voltage at greater capacity, the subject of experiment is 

 more conscious of a " flash " (optical sensation) than of a " stab " 

 (common sensation), whereas high in the energy series, viz., with 

 shorter stimuli by higher voltage at lower capacity, the subject feels 

 a "stab" (common sensation) more readily than a "flash" (optical 

 sensation). This indicates that longer stimuli are better adjusted to 

 the excitability of the retina, shorter stimuli to the excitability of 

 common sensory terminal organs. 



Eyeball. E = 12000 ohms. 



-F. 



y. 



FY. 



! 5FY 2 . 



C. 



0-020 



60 



1 -2 



360 



217000 



0-025 



50 



1 -25 



312 5 



145000 



0-030 



40 



1 -2 



240 



96500 



0-040 



30 



1-2 



180 



54300 



0-080 



20 



1-6 



160 



18100 



0-250 



10 



2 -5 



125 



2900 



1 



5 



5-0 



125 



362 



0-015 



60 



0-9 



270 



290000 



0-020 



50 



1 -o 



250 



181000 



0-030 



40 



1 2 



240 



96500 



0-040 



30 



1-2 



180 



54300 



0-060 



20 



1-2 



120 



24100 



0-200 



10 



2 -0 



100 



3620 



0-500 



5 



2-5 



62-5 



724 



Pain. 



Flash. 



Pain 



Flash. 



000166 

 000208 

 000250 

 000333 

 000665 

 002030 

 008320 



000125 

 000166 

 000250 

 000333 

 000499 

 001660 

 004160 



Frgs 



400 



Pain to short stimuli, light to long stimuli. 





































V! 



















































































"FU 



isti! 





300 

 200 

 WO 



60 



Vctts. 



50 



40 



<50 



BO 



10 



This principal conclusion is confirmed by experiments conducted on 

 the first plan of procedure, viz., by testing with stimuli of equal energy 

 VOL. lxv. s 



