The refractive indices of ten liquid organic halides and three parent hydrocarbons have been measured for seven spectral lines in the visible region;The densities of the above compounds have been accurately determined;Their molar refractions have been calculated for each of the seven spectral lines;A dispersion equation has been fitted to each compound;The molar refraction extrapolated to infinitely long wave-length has been calculated;The molar refractions of the six ortho- and meta-halo-nitrobenzenes as well as nitrobenzene have been measured in 0.2 and 0.4 mol fraction solutions in dioxane;The atomic refractions for the Na D line and for infinitely long wave-length have been calculated and compared for the halogen of each compound;The atomic dispersions of the halogens have been calculated and compared for each of the liquid halides.