922 MR. W. C. D. WHETHAM ON THE VELOCITIES OF THE IONS. 
fore, very small, and, as in the case of common mineral acids, the conductivity is 
chiefly due to the motion of the hydrogen. 
The following table gives the velocities of all ions which have been experimentally 








determined. 
Specific ionic velocity in | 
centims. per second. | 
Name of ion. Gtslloninvail Observer. 
from Kout-| Directly 
RAUSCI’S observed. 
theory. 
Elydrogenk(Gmichlorides)) js. eae eee le nO,0028 0-0026 O. J. Lover 
5 (in serene) Her Meghna pl ne ita a ee O000048 0000065 W. C. D. WuertHam 
Copper . Tecan rere Propane Tee 56 0 00031 - 
Be ears ate group (Cry 0. ) ME eee at ma ane eee hat On OOO 0:00047 | i 
Barium. eae trey otra 0; 00034 9000389 | 
(Celkerinyans Iecreead tas in tate renee emai mere lt (OROLO O19) 000035 | ‘ 
Silver . . SL Oe eke e a eae el ORO OOLG 000049 | 
Sulphate group (SO, Ne ible is oh send paca ese || 300049. 0:00045 9 
Cobalt (in alcoholic CoC, Es) igh acti acaauibistn ieele iantenlis<| He 0:000022 | A 
( bp COUNOD See Boies ater ere a5 0-000044 | 3 
Chlorine (in alcoholic CoCl,) . alas 56 | 0000026 | 5 
Nitrate group (NO) (in alcoholic Co(NO; 3 ). ae ie 0000035 | 58 
| 


The values in the second column are calculated from Kontrauscn’s theory for 
solutions of the same concentration as those used for the direct observations. LopGE 
does not give the strength of his solution, but, as the molecular conductivity of dilute 
hydrcchloric acid does not alter much with change of concentration, the number 
given, which is calculated for a decinormal solution, is, probably, fairly comparable 
with that observed. The velocity of copper was measured in chlorides, and the data for 
the calculation from theory are not known for this salt. The specific ionic velocity of 
copper, at infinite dilution, is given by KouLRauscH as 0°00031 centim. per second. 
The sum of the ionic velocities of cobalt chloride in alcohol, as calculated from the 
conductivity of the solution, is 0°000060 centim. per second, and that of cobalt nitrate 
is 0°000079. These numbers are to be compared with the sums of the observed 
velocities given in the table, namely, 0°000048 and 0-000079 respectively. 
