4l3 
Ions 
1901 
a 18 
1908 
z 18 
Li° 
+ 0.0261 
+ 0.0265 
Na 0 
+ 0.0245 
+ 0.0244 
K° 
+ 0.0220 
+ 0.0217 
Rl° 
+ 0.0217 
+ 0.0214 
Ag 3 
-f 0.0231 
+ 0.0229 
H° 
+ 0.0154 
+ 0.0154 
Cl' 
+ 0.0215 
-f 0.0216 
F' 
+ 0.0232 
4 0.0238 
1' 
+ 0.0206 
-F 0.0213 
The water used in these experiments was carefully purified. by 
Jones and Mackay’s l ) method, and collected in wellsteamed resistance 
glass vessels. Freshly purified water was nsed in all experiments. 
The conductivity of the water used varied from 4 X 10~ 6 to 
5 X 10~ 6 at 0°. 
The measurements were carried out by the alternating current- 
telephone method in a closed weil platinised cell, with a thermo- 
meter tightly fitting its mouth. In our 
hot and moist climate, moisture con- 
denses in the interior of vessels sur- 
rounded with ice ; so there is the danger 
of dilution of the Solutions in open 
mouth cells; but this difficulty is removed 
by having closed vessel for putting in 
solution. Thebath was of pure meltingice. 
The temperature as indicated by the 
thermometer was kept constant for 
nearly half an hour, and then readings 
were taken. The cell was now taken 
out of the bath and made to attain the 
ordinary laboratory temperature, and 
diluted with calibrated Standard pipettes. 
Merck’s chemically pure substances were purified by repeated crystal- 
lisation and dried according to the nature of the substance in question. 
Hydrochloric acid was prepared by dissolving in conductivity 
; ) Zeit. Phys. Chem. 22 , 237, (1897). 
27 * 
