This paper successfully correlated the dipole moments of substituted anilines with σ constants of the corresponding substituents and showed that under certain conditions the melting points of substituted anilines likewise have good linear correlation with the same set of constants.It is shown that the application of the σ^- values obtained in this work to the linear correlation of anilines in the infrared absorption spectra improved values on correlation coefficients as compared with those obtained by using the most suitable set of σ values hitherto available and that part of these linear correlations could be extended to the near infra-red region.