252 
THOMPSON YATES LABORATORIES REPORT 
EXPERIMENT B— continued 
Potential difference between AD (A - ) ... ... ... '00840 Daniell. 
BC (B - ) -00068 „ 
(a) Electrode A connected up to electrode D, then it was found 
that B was positive to C ... ... ... ... -00252 „ 
(b) Electrode A connected to D through a resistance of 100,000 
ohms, then B was positive to C ... ... ... -00144. » 
(c) Connexion between A and D broken, then B was negative to C -00068 „ 
EXPERIMENT C 
Vagus Nerve of Cat 
Nerve laid upon four electrodes — A, B, C, D. Cross section at A. 
Length of Nerve AD 
BC 
AB 
Resistance of AD 
„ Electrodes 
.-. of AD + electrodes 
Resistance of BC 
Calculated resistance of BC (from 3, 2, 1) 
Potential difference between AD (A — ) ... 
BC (B-) ... 
A connected to D. B remained negative to C 
3.9 centimetres 
0.7 
07 
102,200 ohms. 
6, coo „ 
108,200 „ 
28,460 ,, 
(1) 
(2) 
(3) 
18,300 ohms. 
•00752 Daniell. 
•00144 » 
■00012 „ 
EXPERIMENT D 
Sciatic Nerve of Cat 
Nerve was laid upon four electrodes — A, B, C, D. Cross section at A. 
Length of nerve AD 
BC 
AB 
Resistance of AD 
,, Electrodes 
,, AD and electrodes 
BC 
Calculated resistance of BC 
Potential Difference between AD (A - ) 
BC (B-) 
(a) Electrode A having then been jointed to electrode 
difference between BC (B - ) 
3 '4 cms. 
07 » 
07 „ 
18,500 ohms. 
6,000 ,, 
24,500 „ 
10,870 „ 
18,500 
3'+ 
x 7. 
D, the potential 
3,800 ohms. 
■00960 Daniell. 
•00224 " 
•00076 „ 
If, iii these experiments Helmholtz's general principle is applied and examined 
by means of the data given, it will be seen that it explains all the results obtained. 
If it is true that the moment a current is derived through the arc DA that 
then the distribution of potential in the nerve is precisely altered as if the same 
