246 
Proceedings of Royal Society of Edinburgh. [sess. 
Summary of Results. 
1. With weak currents there is the ordinary negative variation 
both on anodic and cathodic side, however close the galvanometer 
and polarising circuits may he brought to each other. 
2. As the strength of the polarising current is increased, the 
negative variation on the anodic side passes into a positive variation, 
which increases and apparently reaches a maximum. 
3. The maximum of the positive anodic variation corresponds to 
a density of current which is not far from that for which the intra- 
polar variation is at its minimum (zero). 
4. On the cathodic side the variation is always negative with 
currents above the very weakest. (With very weak currents, fresh 
nerves, and short period of flow, sometimes a small positive varia- 
tion seems to he got.) 
5. The greater the distance between the polarising and galvano- 
meter circuits, the stronger must the polarising current be for which 
the positive anodic variation first appears. 
All these results hold when the electrotonic currents are com- 
pensated. 
Experiment 8. 
Distances — a , 9 mm.; 5, 7\ mm.; c, 1 mm.; d, 9 mm. 
Polarising 
Current. 
Extrapolar 
Stimulation 
Effect. 
Intrapolar 
Stimulation 
Effect. 
4 D 4r 
38 
0 
4D! 
57 
5 
4 D l 
39 
Experiment 9. 
Distances — a , 9 mm. ; b, 7£ mm. ; c, 1 mm. ; d, 9 mm. 
Polarising 
Current. 
Extrapolar 
Stimulation 
Effect. 
Intrapolar 
Stimulation 
Effect. 
4 D 4, 
+ 214 
+ 50 | 
4 D 4 
+ 81 
+ 55 J 
4 D| 
+ 230 
l 
4 D | 
+ 170 
Here before passing current 
there was a stimulation 
effect of 38 in same direc- 
tion as intrapolar effect. 
Here there was a stimulation 
effect of 87 in same direc- 
tion before passing current. 
