356 
MR. W. C. D. WHETHAM ON IONIC VELOCITIES. 
Cue RENT from red to blue. 
V = '50 '47 ‘41 ‘40. Mean, ‘44 centim. per hour. 
G— 49-8 49'8. „ 49°‘8 
Current from red to blue. 
V = ‘41 ‘45 ‘48 ‘47 *34 *43. Mean, ‘43 centim. per hour. 
G=49‘6 49-1 48-8 49‘0 487. „ 49^‘0 
Thus the velocity is practically the same in both directions, and the mean values 
are v = 0'4'2 centim. per hour and G = 49°‘2. 
The conductivity of the chloride was found by Fitzpatrick’s method to be 
2‘86 X 10“^® C.G.S. units, which gives 
= vKjyr^ = 0‘000026 centim. per second 
for the velocity of chlorine in this solution. We see at once from this result, that 
conductivity and specific ionic velocity for different solvents are, at any rate approxi¬ 
mately, proportional to each other. The conductivity of these alcohol solutions is about 
one-tenth, or rather less, that of an acjueous solution of a neutral salt of equivalent 
strength, and we see that the ionic velocity of chlorine is reduced to rather less than 
one-tenth of its usual value for aqueous solution. This confirms the result at which 
we have already arrived, viz., that all the molecules are concerned, at any rate 
in turn, in the process of electrolysis, and that the cause of the increased resistance is 
a decrease in the average ionic velocity. 
In order to obtain the velocity of the cobalt ion, solutions of cobalt and calcium 
chlorides were set iqi of strength 0‘05 gnu. equivalent. 
Current upwards. 
V = ‘30 ‘26 ‘20 ‘24. Mean, 0‘25. 
G = 45-8 45-4 45‘6 45‘4. „ 45°‘6. 
Current downwards. 
V = ‘26 ‘24. Mean, 0.25. 
G=46‘9 48-0. „ 47°‘5. 
Current upwards. 
•30 -21 -26 -28. Mean, 0‘26. 
47-9 47-0 „ 47^-4. 
