THE INJURY CURRENT OF NERVE 
295 
The limits within which the relation is most true is seen to be from 75 per 
cent, to 3'o per cent., within which it may be said that the relation is actually that here 
stated. But when solutions are used much below the strength of the isotonic solution, 
the limit of even approximate truth is rapidly reached and passed. The reason, or 
certainly one of the reasons, of this fact is not far to seek, and is clearly brought out 
by the details of the following experiment, and by the curve drawn from them and placed 
in the diagram given (-45 per cent, curve) : — 
EXPERIMENT IIa 
(An Expansion of the Details of Experiment II) 
Potential 
x io-3 Daniell 
Differences 
In terms of the original 
as unity 
Upon removal . 
I y I 
i - oo 
(5) 
After 5 
min. in 
■45 NaCl 
24-0 
I '40 
(10) Anothe 
r 5 min. 
in 45 NaCl ... 
23-9 
i"37 
(15) 
11 
20'6 
1 -20 
(20) 
?y 
jy 
187 
I-09 
(*5) 
17 
?? 
r 3 -6 
079 
(3o) 
it 
10-3 
o - 6o 
(35) 
?> 
7*9 
0-46 
(+0) 
)» 
6-i 
0-35 
(45) 
3'+ 
0 - 20 
In this case the value of the potential difference after 25 minutes in the solution 
is 079. 
'79 = ~ x = -35 
45 
