294 
THOMPSON YATES LABORATORIES REPORT 
more rapid and more complete decline of the injury current the less their concen- 
tration. This later decline is advisedly called 'more complete' since the previous 
experiments have shewn it to be irreparable, and quite unlike the decline observed 
after immersion in more concentrated solutions, which can be recovered from by a 
subsequent immersion in water. 
Such a comparison of the effects of solutions of different concentrations is also 
fully justified by an examination of the numerical values. 
Let us, as a test of this statement, assume that during the first twenty-five 
minutes of immersion the ' internal solution ' of the nerve is not greatly modified, 
then the modifications in the value of the potential difference should be compara- 
tively simple, and should, crudely, vary inversely with the concentration of the 
solution used to replace the external solution. 
Experiment III — ■ 
= -6984 
Experiment IV — ■ -786 
Experiment V — 1 - o6o 
The value x obtained upon the assumption that the values vary inversely with 
the concentration of the experimental solution made use of, are seen to be 
approximately similar enough to justify the assumption within these limits of concen- 
tration. It is even possible to extend these limits widely, and still the facts remain 
fairly closely within the limits of this relation. 
Thus, from experiments performed, including those given above, the following 
table was constructed and published in a preliminary communication* : — 
Strength of Experimental Solut on 
Value of x as calculated 
of NaCl 
above 
o - 6 grammes per cent. 
•6360 
075 » » 
■6908 " 
°'9 » » 
•7074 
- 
18 „ „ 
•6984 
r° » „ 
■7 1 10 , 
6-o „ „ 
■6_| 20 
9"° » „ 
•5580 
* Proceedings Royal Society, 67, 321 
x = 7074 
x = -6360 
