THE INJURY CURRENT OF NERVE 
253 
current passed from A to D along the nerve, it must follow that the difference of 
potential between any two points, whether upon the wire path or the nerve, are 
affected in a manner which can readily be calculated. 
The newly created difference of potential between points B and C upon the 
nerve should be equal to 
Resistance between B and C , 
-= : ; ; ; ; — x Potential difference between AD 
total resistance in circuit 
Where a pre-existing difference of potential is found between B and C, the 
old and the new should algebraically sum. These simple calculations, made for 
the four experiments given, are embodied in the following table : — 
Data 
Resistance of 
BC 
Total 
Resistance 
Potential Differences 
between Points AD 
Potential Differences 
pre-existing between 
Points BC 
Experiment A 
to 
54,000 
I 35,000 
•0071 2 Daniell. 
O 
to 
54,000 
235.OOO 
?) 
O 
M 
99 
285,000 
?> 
O 
?? 
33 5,000 
)? 
O 
Experiment B. 
to 
85,800 
2 10,400 
•00840 Daniell. 
•00068 Daniell. 
to 
3 10,400 
Experiment C 
to 
18,300 
108,200 
•00752 
•00144 » 
Experiment D 
to 
3,800 
24,500 
•00960 
•00224 » 
Value for subsequent Potential Differences between Points 
B AND C. 
Calculated 
Found 
A. (a) 
•OO284 
•OO280 
to 
•OO163 
•OOl68 
(0 
•OOI33 
•001 28 
•OOI 14 
•00108 
B. (a) 
•CO274 
•00252 
to 
•OO164 
•00144 
C. (a) 
— -oooi 7 
-OOOI 2 
D.to 
— ^00076 
-00076 
