520 
MR. F. GOTCH ON THE ELECTROMOTIVE PROPERTIES 
Galvanometer closed] T -Jj after excitation + 
Fall of organ-current, which subsided 
slowly, until in three minutes it sank 
150 scale. It was then compensated. 
Galvanometer closed 1" after excitation . . + 
Fall of organ-current as before = 80 scale. 
Galvanometer closed 2" after excitation . . + 
Fall of organ-current = 75 scale. 
Galvanometer closed 3" after excitation . . + 
Fall of organ-current =75 scale. 
Galvanometer closed 4" after excitation . . + 
Experiment repeated: — 
Galvanometer closed x§o" alter excitation + 
Fall of organ-current = 60 scale. 
Galvanometer closed 1" after excitation . . + 
Fall of organ-current = 45 scale. 
Galvanometer closed 2" after excitation . . + 
Fall of organ-current = 35 scale. 
Galvanometer closed 3" after excitation . . + 
Fall of organ-current = 35 scale. 
It was evidently necessary to extend the observations far beyond the limit of 3", 
and this was now done in a similar preparation made from the organ of the other side 
of the same large Torpedo. In this the organ-current was very steady, the prepara 
tion having been made an hour before, and being first used for a rheotome experimen- 
on the duration of the first part of the response. It amounted to *01 R, and was 
observed to sink after each excitation; the decline, being opposed to the after-effect, 
was only indicated after the return of the needle to zero, which occurred in about half 
a minute, by a slow movement of the needle in the opposite direction, amounting in 
three minutes to 75 scale. 
650 
1 
300 
210 
165 
120 
(•06"-l") 
350 
(l"-2") 
90 
(2"-3") 
45 
(3"—4") 
45 
640 
250 
190 
155 
(•06"-l") 
400 
(l"-2") 
60 
(2”-3") 
35 
Galvanometer closed 
•06" 
after excitation + co 
( + 120 G. A) 
(■06"—l") 
^ 450 
59 
55 
1" 
55 
5 9 
+ 750 j 
(l"-2") 
} 175 
59 
95 
2" 
55 
55 
+ 575 j 
(2"-3') 
125 
55 
55 
3" 
55 
99 
+ 450 j 
(3''-4") 
85 
95 
55 
4" 
55 
59 
+ 365 =! 
(4"-5") 
> 95 
55 
55 
5" 
55 
95 
+ 270 J 
(5"-10") 
65 
95 
55 
10" 
55 
55 
+ 205 \ 
(10"—15") 
45 
59 
59 
15" 
55 
55 
+ 160 j 
(15"—20") 
\ 25 
9 9 
59 
20" 
55 
55 
+ 135 J 
(20"-25") 
1 35 
9 ) 
9 > 
25" 
>9 
55 
+ 100 j 
(25"-30") 
j> 25 
*9 
59 
30' 
59 
59 
+ 75 1 
