INORGANIC RESPONSE 165 
3. Transient rise of current on cessation of light.— 
Another very curious fact observed in the retina by 
Kuhne and Steiner is that immediately on the stoppage 
of light there is sometimes a sudden increase in the 
retinal current, before the 
usual recovery takes place. 
This is very well shown in 
the series of records taken 
by Waller (fig. 106). It 
will be noticed that on illu- 
mination the response-curve 
rises, that continued illumi- 
nation produces a decline, 
and that on the cessation of 
light there is a transient rise 
or current. I give here a 
series of records which will 
show the remarkable simi- 
larity between the responses 
of the cell and retina, in re- 
spect even of abnormalities 
so marked as those described 
(fig. 107). I may mention 
Fic. 107.— RESPONSES IN SILVER 
here that some of these Cask 
eurious effects, that is to The thick line represents response 
during light (half a minute’s 
ralim : amie exposure), and dotted line the 
Say, the pr eliminary negatl\ e recovery during darkness. Note 
fwiteh and sudden augmen-  — %® ‘*mins! positive fied 
tation of the current on the cessation of light, have also 
been noticed by Minchin in photo-electric cells. 
4. Decline and reversal.—We have seen that under 
the continuous action of light, response begins to 
