The period number per second 
171 
TABLE I. Binocular fatigue 
st ys „ go” 150” f 
ed eN Nou rr Va LO ar 
little 
an 
a a 
BE o 
= 
© 
Mews = 
o 
op © 
nde 
D on 
z jo) 
Les 
5 
FS © 
— 
= 
ap 
fate 
ie page 
See 
Kor’ 
See hee ey Times in 
10 10seconds 
process, or in better words, a modification of state, Consisting 
of two antagonistical moments, which are dependent on the time-factor 
according to fixed laws. 
From the controlling experiments, in which a constant width of 
the pupils had been obtained, follows, that the modification of the 
limit values represented in our curves cannot be attributed to a 
modification of the quantity of the light, which is connected with 
the reflectoric narrowing and gradually widening of the pupils at 
the strong irritation. The modification of the brightness of the sur- 
roundings of the flickering plane is likewise without influence. (This 
modification is always caused by the intensive gradually disappearing 
after-images of the stimulus of fatigue). The corresponding control 
has, namely, shown that in one and the same series of experiments 
