BY MIXTURES OF ELECTROLYTES.—BARNES. 149 
acid, were prepared and their conductivities measured at 18° 
and at 0°. The conductivity of the water used in the prepara- 
tion of these solutions was measured at both temperatures, and 
its value substracted in each case from the conductivity of the 
solution. Considerable care was required with these dilute 
solutions to obtain good results. The electrodes were thoroughly 
washed with a portion of the solution before placing them in 
the cell. Both the solutions and the water used were exposed 
as little as possible to the air, and the measurements were taken 
immediately after a solution was made. The measurements 
were repeated three times, and the mean of the values obtained 
was taken as the most probable value. 
The following Table I gives the values thus obtained, and the 
ratio 8° where “,, and mw, are the specific molecular con- 
His 
ductivities at 18° and 0° respectively. The concentrations are 
expressed in gramme-molecules per litre at 0°, and the specific 
molecular conductivities in terms of this unit and of 10~* times 
Kohlrausch’s new unit of conductivity. 
