Race differences in the judgment of statements of attitude toward the Negro were examined to assess comparative reference scale shifts over a 35-year period Reference scale origin became more pro-Negro for both races over tune, with whites shifting more than Negroes In 1929 Negroes judged the items as being more anti-Negro than did whites, this race difference was reversed for the 1962 and 1964 samples Reference scale unit was smaller for Negroes than for whites at all time periods, and both races showed a reduction in unit between 1962 and 1964. A linear function was consistently obtained between reference scales measured at two points in time, as well as when comparing one race to the other The assimilation-contrast and variable perspective social judgment formulations were evaluated in terms of their ability to account for the observed reference scale differences.