on the Area of Electrification. 
91 
arrangement — B being the battery; Gt, tangent-galvanometer: 
R, rheostat; and S, switch. 
I. Influence of Current. — In this series of experiments a 
5-per-cent. solution of copper sulphate was employed. The 
results obtained and the current employed are set out in the 
following table. The numbers refer to lengths in millimetres 
of the several electrifications and intermedial spaces. 
Current in 
— electrifi- 
Intermedial 
+ referred to 
amperes. 
cation. 
space. 
— as unity. 
o-i 
4 
nil. 
0-2 
13 
signs at end edges. 
0-4 
18 
30 
19 
1-05 
06 
18 
18 
31 
1-72 
0-8 
16 
16 
35 
249 
10 
17 
12 
38 
2-23 
1-2 
18 
11 
38 
211 
1-4 
19 
10 
38 
2-00 
1-6 
21 
8 
38 
1-81 
1-8 
22 
7 
38 
1-72 
20 
23 
6 
38 
1-65 
The usual sign of + electrification was invisible on the 
analyzer in the first experiment, but the — was sufficiently 
marked to permit of measurement. 
The relation which I have already shown to exist between 
the magnitude of the intermedial space on an analyzer and 
the force required to separate an electrolyte into its consti- 
tuent ions (Phil. Mag. Oct. 1881) naturally led me to look 
for some well-defined relation between the intermedial »pace 
on the analyzers and the current. The electromotive force 
between the electrodes, and therefore, as it may be supposed, 
of the molecules of the electrolyte, varied of course with the 
