Measurements of infinite dilution binary diffusion coefficients D-12 of ethanol in water at 2.3 to 60 degrees C and of carbon dioxide in water at 3.8 to 50 degrees C, both at an atmospheric pressure, were made by the Taylor dispersion method. The D-12 Values for both solutes were determined by the method of curve fitting in the time domain. Erroneous values for D-12 Of CO2 were obtained by the moment method due to the response curves having tailing. The measured D-12 values for both solutes were well correlated with the water viscosity with the average absolute deviation AAD = 1.2% for ethanol and AAD = 6.3% for CO2. The Wilke-Chang equation was less accurate in predicting the D-12 for both solutes.