We report the results of our studies on the optical and thermal properties of two non-mesogenic compounds N-Cetyl-N, N, N, trimethyl ammonium bromide (CTAB) and Glacial acetic acid (GAA). The mixture exhibits schlieren texture, which is the characteristic of micellar nematic lyophase at higher concentrations of CTAB. The Sm A and Sm E phases are occurs at lower concentration of CTAB at higher temperatures when the specimen is cooled from its isotropic phase. The order parameter of micellar nematic phase of the mixture is estimated. The temperature variation of order parameter of the experimental curve is well fitted with the Mayer-Saupe theoretical curve.