THE INJURY CURRENT OF NERVE 
Taking the data from this table, let us arrange them in a manner which will test 
the hypothesis, that the law discovered for hydrochloric acid solutions is not peculiar 
to it, but is common to all solutions of electrolytes. 
Ew 
1 k 
log. - 
The number, which is the logarithm of the ratio between the final and initial 
value of the potential difference, is always equal to a constant 'k' divided by the 
concentration of the experimental solution expressed in gram molecules per litre. 
To test such an opinion it is only necessary to obtain the ratio =— ; to find the 
number of which this value is the logarithm; and to multiply the value thus found by 
' n ' the concentration. 
k 
Since - n 
k. 
Found in this way, the value ' k ' should be constant for each electrolyte. 
The following tables of data provide the briefest method of describing the 
results of this test of the hypothesis. 
Solutions of Ammonium Chloride 
Number of Experiment 
Ew 
Ea 
k 
11 
11 
Therefore k is 
equal to 
Experiment V 
'°45 = log. 
no 
1 
no 
>> 
VI 
•i 02 = „ 
1-26 
1 
1-26 
>> 
VII 
■325 = „ 
2 - I 1 
1 
1-05 
>> 
VIII 
•33o = » 
2-14 
1 
1 -07 
>> 
IX 
•654-= „ 
4-5i 
1 
4 
«'«3 
»> 
X 
•88+ = „ 
7-66 
1 
s 
0-96 
tLco ,.1/ \ 
=r- = log. - (approx.) 
.La n 
