THE INJURY CURRENT OF NERVE 
255 
Experiment Performed 
(a) Electrode A connected to D through a closed key. 
Potential difference between BC now (B - ) -00064 Daniell. 
Key connecting A to D opened. 
Potential difference between BC now (B — ) -00448 ,, 
(i>) Electrode A connected to D through a resistance of 100,000 ohms. 
Potential difference between BC now (B -) -00390 Daniell. 
Connexion between A and D removed. 
Potential difference between BC now (B ) -00448 ,, 
(c) Experiment of new type. 
Electrodes B and C were connected through a key. 
When this key was closed, the potential difference between 
points A and D was measured and found (A — ) ... -01305 Daniell. 
When this key was opened, the potential difference between 
points A and D was measured and found (A - ) ... -01450 Daniell. 
Treating as before the data from this experiment. 
In case (a). — The potential difference between B and C due to the closure of the circuit 
forming AD, 
5,200 
= -oiJ-5 x = -oo;Q7 (B + ) Daniell. 
TJ 19,000 jy/ \ 1 
The pre-existing potential difference between these points ... -00448 (B - ) Daniell. 
The algebraical sum of these values ... ... ... -00051 (B — ) „ 
and this is the calculated value. 
The value actually found ... ... ... ... -00064 (B - ) ,, 
In case {b) 
The potential difference between BC due to closure of the circuit AD. 
5,200 
= '0145 x Daniell (B + ) 
1 19,000 
= -00062 Daniell (B + ) ... ... ... ... ••• (0 
But B was originally -00448 (B - ) ... ... ... ... ... (2) 
The algebraical sum of these values = -00386 Daniell (B - ), and this calculated value 
closely agrees with the value found which was -00390 Daniell (B — ) 
Value calculated 
Value found 
In case (17) 
■0005 1 (B — ) 
•00064 (B - ) 
0) 
•00386 (B - ) 
•00390 (B - ) 
Case (c) requires to be considered by itself. 
In considering the data from case c (Experiment E), the circuit formed by the 
closure of electrodes B and C, and by the intervening stretch of nerve BC is alone 
