352 
MR. W. C. U. WHETHAM OX lOXIC VELOCITIES. 
Current Downwards. Movement Upwards. 
Galvanometer. 
Time. 
Po.sition. 
Galvanometer. 
Time. 
Position. 
1 
Result. Centims. per hour. 
14-0 
11.40 
24-14 
O 
14-0 
11.55 
23-81 
•33 ] 
.41 
-10 
.56 
•78 
•32 
1-28 
.42 
•07 
.57 
•76 
•31 / 
13-8 
3.2.5 
24-14 
13-7 
3.55 
23-46 
•68 ■] 
.26 
•11 
.56 
•43 
•68 ) 
1-37 
.27 
•10 
.57 
•41 
•69 J 
1.3-6 
4.20 
22-04 
13-1 
4..50 
21-44 
•60 1 
.21 
•02 
.51 
•39 
•63 
1-23 
.22 
•00 
..52 
•38 
•62 / 
Means—Downward velocity 
G. 
Upward velocity . 
G. 
This gives 
and 
V = 1-37 
= 1'44 centims. per hour. 
. . = 12°-6 
= 1'29 centims. per hour. 
. . = 13°-7 
G = 1.3°-2, 
Vi = vKlyr — 0‘00047 centim. per second. 
Thus the value obtained for the specific ionic velocity is independent of the E.M.F. 
applied, i.e., the velocity of the ions is proportional to the potential gradient. 
New solutions were afterwards set up and the experiments with the large E.M.F. 
repeated. The results were— 
Movement upwards : 
■i;= 4-98, 4-84, 4-32, 4-G6, 4-G2. 
G;= 43-8, 43-8, 43-0, 43-2, 43-2. 
Means ; 
R = 4-74 G = 43-4 = -00044. 
Movement down-wards ; 
V = 5-02, 5-lG, 4-78, 4-70, 4-GG. 
G= 42-5, 43-4, 43-0, 43-0, 42-8. 
Means : 
V = 4-8G, G = 42°-0, therefore, = ’00049. 
Mean of in both directions = 0-00046. 
Taking the mean value deduced from all thi-ee series of separate experiments, we 
get 
