236 THOMPSON YATES LABORATORIES REPORT 
(<:) That the fact of changing the point of reference from one cross section to 
another does not, in the slightest degree, alter the relative value of points upon the 
longitudinal surface to one another. 
(d) That the lapse of time does reveal a definite but small alteration in the 
relative value of points upon the longitudinal surface. In this case the alteration is 
such as to make the potential curve a more obviously asymmetrical one. 
The experiments upon vagus nerves which follow are given for the present 
without comment as examples, carefully worked out, of the distribution of potential 
upon excised nerve. 
EXPERIMENT II 
Vagus Nerve of Dog 
Piece of Nerve 1 1 centimetres long. Ligatured and cut at both ends 
Points upon the longi- 
tudinal surface distant 
from the other end 
Potential Differences measured from 
Average Value 
(correction for altera- 
tion with time) 
the upper injury 
i centimetre 
•00352 D. 
•00328 D. 
34-0 x io _ 4 D. 
2 
•00508 
•00446 
477 
3 
•00500 
•C0432 
46-6 
4 
•00492 
•00432 
46-2 
5 
•00508 
■00444 
47-6 
6 
•00500 
•00452 
47-6 
7 
•00508 N ' 
•0045 2 
48-0 
8 
•00508 
•00480 
49'4 
9 
■00520 
•00504 
51-2 
IO 
•00372 
•00372 
3? . 2 
