524 
MR. F. GOTCH ON THE ELECTROMOTIVE PROPERTIES 
Polarising current. 
15" readings. 
15" readings. 
15" readings. 
4 Groves, duration 
- 265 
- 230 
- 230 
direction ( + ), gal- 
- 170 
- 110 
- 110 
variometer u_. 
- 130 
- 50 
- 40 
- 100 
- 30 
- 10 
- 70 
- 15 
- 50 
- 30 
4 Groves, duration 1", 
- 360 
- 380 
— 400 
direction ( + ), gal- 
- 200 
- 200 
- 200 
vanometer y-g- 
- 110 
- 100 
- 110 
- 70 
- 60 
- 60 
- 45 
- 40 
- 40 
- 30 
- 20 
- 20 
duration 
duration 2" 
duration 3" 
4 Groves, direction ( — ), 
+ 170 
+ 260 
+ co 
galvanometer 
+ 70 
+ 120 
+ 350 
+ 45 
+ 60 
+ 190 
+ 40 
+ 140 
+ 110 
+ 100 
+ 85 
+ 80 
Besides showing the susceptibility of the tissue to polarisation, and the subsidence 
of the effect, the experiment shows that the ( + ) polarising current is more effectual 
than the ( —) for the production of the polarisation after-effect. The polarising 
current was increased to G Groves without altering the result as regards the direction 
of the after-effect. When, however, the current of 6 Groves was led through narrow 
strips of fresh tissue cut from the organs of vigorous fish, a different result was 
obtained. The passage of the ( + ) current was now followed by a ( + ) after-effect; on 
repeating the experiment, the effect soon disappeared, and only the ( —) polarisation 
after-effect was observed. Two examples may be given. 
Strips of organ, 22 mm. long and 3 mm. thick, were cut from the organ of a medium¬ 
sized fish. Organ-current, -j- '0062 R. 
Polarising current. 
Duration. 
1" 
2 
1 // 
4 
X" 
4 
A" 
4 
1" 
4 
6 Groves, galvano¬ 
meter ( + ) 
- 70 
+ 190 
- 65 
- 110 
- 190 
Polarising current. 
Duration 
Galvanometer ( — ) 
+ 135 
