434 
Lincoln—Electrical Conductivity . 
alcohol, the dielectric constant of which is about 32, yields di¬ 
lute solutions of S(C 2 H 5 ) 3 I that conduct better than those in 
water, the dielectric constant of which is about 80. The reverse 
is the case in concentrated solutions. (See Table XXVIII.) 
The coefficients of association of the alcohols show that their 
molecules are polymerized, but the conductivity is not propor¬ 
tional to the degree of polymerization. The illustrations given 
above in regard to the dielectric constants are applicable here 
as well. 
The conductivity increases with the temperature for the de¬ 
terminations that have been made, and no exception has as yet 
been found. There are not sufficient data to determine accu¬ 
rately the temperature coefficient of all alcoholic solutions; but 
it can be stated that, in general, the conductivity does not in¬ 
crease proportionately with the temperature. It has been pointed 
out by Holland and by Zelinsky and Krapiwin — and later it 
has been confirmed by Cohen as well as by Walker and Hum¬ 
bly 1 — that the temperature coefficient seems to be but slightly 
influenced by the addition of a non-electrolyte or even of a small 
quantity of water. 
The investigation that has been carried on with mixtures of 
water and alcohol is of considerable magnitude; but as it has 
very little bearing upon the subject in hand, not much attention 
has been paid to it, and consequently very little reference will 
be found to it in this discussion. But it might be within the 
compass of this work to mention the investigations of Cohen 2 
and perhaps those of Zelinsky and Krapiwin. 3 The following 
table of comparative conductivities is taken from the work of 
Zelinsky and Krapiwin. In the column headed A is given the 
conductivity in aqueous solutions, under B in methyl alcoholic 
solutions, and under C is given the conductivity in a 50 per 
cent, solution of methyl alcohol and water. 
1 Jour. Chem. Soc ., 71, i, 66; 1897. 
2 , 3 Loc. cit. 
