604 
ME. J. HOPKINSON ON THE 
I. 
II. 
III. 
I. 
H. 
III. 
i 
190 
0-36 
15 
17 
0-050 
1 
106 
0-21 
20 
14 
0-045 
2 
57 
0-12 
30 
11 
0*040 
3 
42 
0-094 
40 
7 
0-032 
4 
36 
0*084 
50 
5 
0-029 
5 
30 
0-074 
60 
3 
0*025 
7 
26 
0-066 
90 
0 
0-020 
10 
22 
0-060 
180 
-5 
0-011 
Experiment h . — This experiment was tried both with a positive and negative charge 
The charge lasted 90 minutes. The readings were made as in y. 
I. gives the time in minutes ; 
II. the readings when the charge was positive ; 
III. when the charge was negative ; 
IV. the mean of II. and III. ; 
V. the value calculated from y. 
I. 
n. 
III. 
IV. 
V. 
i 
180 
190 
185 
190 
1 
93 
120 
106 
106 
2 
45 
75 
60 
57 
3 
31 
68 
49 
42 
4 
53 
36 
5 
22 
47 
34 
30 
7 
16 
43 
29 
26 
The same experiments were made, hut with time of charging only 5 minutes. 
Columns II. and III. give the means in each case of two separate observations, 
made on different occasions. 
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