Conductivity meaurements of the hydrochloride of aniline, methyl aniline and ethyl aniline in water and in dioxane-water mixturas have been made at 25℃ by using a Jones Bridge. Nleasuremenis of conduetances at 25℃ of these salts have been made in ranging from 0.1 normal to 0.001 normal using water and numerous dioxane-water mixtures as solvents.