The physical properties mentioned in the title have been determined for the six systems: (a) aniline–hexane, (b) methanol–cyclohexane, (c) methanol–carbon disulfide, (d) acetic anhydride–carbon disulfide, (e) acetic anhydride–cyclohexane, and (f) triethylamine–water, over the complete range of composition. All six systems are partially miscible, above or below a critical solution temperature (c.s.t.).From the experimental data, the partial molal heats of mixing have been calculated, using the Redlich and Kister equations. The enthalpy of hydrogen bonding in the triethylamine–water compound appears to be about −1.33 kcal per hydrogen bond.The orientation polarization, according to the Syrkin formula, appears always to exhibit negative deviation from ideality, at least over part of the concentration range.