406 
Lincoln—Electrical Conductivity. 
wise indicated, and the results are expressed in reciprocal mer¬ 
cury units. The higher temperature at which the conductivity 
was measured was obtained by heating the resistance cell and 
its contents in a paraffin bath. Owing to the small quantity of 
the solvents available in most cases it was not possible to make 
the dilutions in the ordinary manner. Five or ten cubic centi¬ 
meters of the solvent were introduced into the resistance cell 
by means of a carefully calibrated burette, the conductivity 
was determined, amd then weighed portions of the salt were 
successively introduced and the conductivity determinations 
made after each addition. 
In the following tables of the electrical conductivity v repre¬ 
sents the volume in liters in which one gram-molecule is con¬ 
tained and fjj the molecular conductivity. Although the conduc¬ 
tivity of the solvent has been determined in each case, it has 
not been deducted. 
METHYL ALCOHOL. 
The sample of methyl alcohol employed was dehydrated sev¬ 
eral times with anhydrous copper sulphate, over which it re¬ 
mained several days and from which it was decanted and dis¬ 
tilled each time. The distillate was then treated with metallic 
sodium and again distilled. This distillate was fractionated 
twice, when a product with a very constant boiling point was 
obtained. The resistance was so great that the conductivity of 
the alcohol could be practically neglected. After standing for 
nine months the specific conductivity had decreased to only 
5.7 X 10 -6 . 
