General Discussion of Results. 
439 
bonate does not conduct, but if one of the ethoxy groups be re¬ 
placed by Cl, the resulting compound possesses dissociative 
power to a considerable degree. Ethyl monochloracetate yields 
.solutions that conduct fairly well, while the substitution of the 
CN group, (thus forming ethyl cyanacetate) yields solutions of 
ferric chloride that do not conduct as well as those of ethyl 
monochloracetate; but the reverse is true in the case of solu¬ 
tions of CuCl 2 . By comparison of Tables XIV, XV, and XVI, 
it will be seen that neither of these solvents yields solutions 
that conduct as well as the solutions of ethyl acetoacetate, as 
far as examined. The esters with the highest dielectric con¬ 
stants usually yield solutions that conduct the best, but there 
are a few exceptions to this. From Tables XVI and XV it will 
be seen that ethyl acetoacetate yields solutions of ferric chlo¬ 
ride that conduct better than those in ethyl cyanacetate, the 
-dielectric constant of the latter being 26.7, while that of the 
former solvent is only 15.7. Then, too, those esters whose die¬ 
lectric constants are very low yield solutions that conduct elec¬ 
tricity slightly—for example, ethyl acetate and ethyl benzoate. 
The coefficients of association that have been determined, 
show that the molecules of these esters are not polymerized; yet 
it will be noted that ethyl acetoacetate yields solutions that 
conduct very well. In all determinations made, it was observed 
that the conductivity increases with both the dilution and the 
temperature. 
COMPOUNDS CONTAINING NITROGEN. 
The nitro compounds of benzene and toluene yield solutions 
that conduct fairly well. The conductivity increases with the 
dilution, and in the ferric chloride solution ^ approaches a lim¬ 
iting value. The conductivity of other salts in nitrobenzene is 
rather low. (See Table XX.) The results of a number of 
cryoscopic determinations are given in Table XXI. From these 
it will be observed that the values obtained seem to indicate 
normal molecular weights for the dissolved substances. These 
determinations indicate that the molecular weight of ferric 
chloride is uniformly higher than the theoretical, and decreases 
with increased concentration of the solution. The same is true 
