1268 
culate the E.M. F. of polarisation which is A= R/,a, in which # 
means the voltage of the battery used, generally about 2 volts, and 
a the galvanometer-constant, i. e. the eurrent-strength, causing a 
deflection of the galvanometer spot over one part of the scale. 
The resistance and polarisation being known at every moment of 
the experiment, we can draw curves showing the variation of the 
current, of the resistance and of the polarisation. In the curves 
reproduced in this paper the vertical ordinates have a distance of 
one second. The moment of the application of the stimulus is indi- 
cated on the basis-line. The original curves are of course much 
longer, as in the euts below only the parts containing the ps.g. 
reflexes are given. 
annen: 
Fig. 1 shows a typical normal reflex. 
The ecurrent-streneth increases after a 
Oo 
very short negative wave, which is often 
found to proceed the reaction. The deflec- 
tion grew from 49.9 to 57.9 millimetres 
(second curve of fig. 1) after a latency 
ce 
of about 2 seconds. During this change 
the resistance (upper curve) diminished 
from 16550 Ohm to 13420 Ohm. The 
».| polarisation (lower curve) first sank from 
al + 0,200 to 0.158 Volt to rise again imme- 
} diately to 0,338 Volt. The highest point 
h af Mii inthe curve was reached somewhat later 
ie. wl 
than the highest point in the current curve. 
Nearly the same variations, though with other absolute values, 
are reproduced in the sets of curves of the figures 2 and 3. Fig. 2 
BIE ] 
C | ie ] Zil ie 
Ik | 7 iL af | (Er 
| + 000) 
+ = = SPF 7 | | IL 
JE [ i 
JS 4B 
t 
| | | Nie 
42 
| 40 
+—+ = 
eI ti Alea) | Tt 
os 
a mf J bee 02 
1 eas 
