Qualitative Determinations. 
405 
needle could be detected. Dutoit and Friderich 1 have shown 
that the nitriles conduct and the results given in this table 
shows that benzonitrile is not an exception. The dielectric 
constant would indicate this; and according to the determina¬ 
tions of Ramsay and Shields, as well as according to those of 
Traube, the molecules of this solvent are not polymerized. The 
solubility of the salts tested in piperidine is very slight except 
mercuric chloride and silver nitrate, and even these do not 
yield solutions that conduct very well. Quinoline yields solu¬ 
tions that conduct, but its molecules are not polymerized. The 
solution of ferric chloride in carbon disulphide did not conduct, 
nor should we expect it to do so from its low dielectric con¬ 
stant. Phosphorus trichloride does not yield solutions that 
conduct. Arsenic trichloride and mercuric chloride are very 
soluble in it, yet there was not the least movement of the 
needle. The solutions of ferric chloride and mercuric chloride 
in arsenic trichloride conduct very well. 
In addition to the results tabulated in Table I it was found 
that stannic chloride dissolved in arsenic trichloride does not 
conduct, and the same was true of phosphorus trichloride. 
When phosphorus trichloride was added to a solution of mercuric 
chloride in arsenic trichloride, the conductivity was decreased 
to such an extent that the galvanometer needle did not even 
move. Further, a large number of other tests were made which 
were too detailed and numerous to include in these tabulated 
results. Suffice it to say, however, that of the very large num¬ 
ber of tests made, both of organic and inorganic substances in 
these numerous solvents, there was not one instance where the 
solution conducted electricity, that the dissolved substance was 
not an acid, a base, or a salt. 
Quantitative Determinations. 
The method of Kohlrausch was employed in measuring the 
electrical conductivity—the resistance cell of the Arrhenius 
pattern being used. This cell was provided with a tightly fit¬ 
ting cover and the electrodes were about three millimeters 
apart. The determinations were made at 25° C. unless other- 
Loc. cit. 
