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The calorimetric heats of adsorption have been measured for argon at -195°on a series of carbon blacks graphitized at the successively higher temperatures, 1000, 1500, 2000 and 2700 °. X-Ray and electron microscope studies reported by Schaeffer, et al., indicate a higher degree of graphitization with increasing temperature of heat treatment; this w-ould result in progressively more homogeneous surfaces within the series. Our experimental results illustrate clearly the change in the shape of the heat-coverage curve with increasing degree of surface homogeneity produced by high temperature heat treatment. These results may be correlated with the stepwise isotherms found by Polley, et al., on the same series of blacks.