(Liquid + liquid) coexistence curve, turbidity, and isobaric heat capacity per unit volume for the critical solution of {benzonitrile + n-tetradecane} have been measured. The critical exponents beta, nu, gamma, and alpha and system-dependent critical amplitudes B, zeta(0), chi(0), and A(+/-), corresponding to the difference of the general density variable of two coexisting phases Delta rho, the correlation length zeta, the osmotic compressibility chi, and the isobaric heat capacity per unit volume CpV-1, have been deduced and were used to test some universal ratios. The behavior of the diameter of the coexistence curves showed good agreement with the complete scaling theory. The analysis of effective critical exponent beta(eff), which was well described by the crossover model proposed by Anisimov and Sengers, and effective critical exponent alpha(eff) indicated monotonic crossover phenomena from 3D-Ising behavior to mean-field one as the temperature departed from the critical point. (C) 2010 Elsevier Ltd. All rights reserved.