HE importance of the Supreme Court's historic decision of May 17 outlawing segregation in the public schools lies in part in the fact that the psychological facts of life have received judicial recognition for the first time. To the obvious impact of segregation in depriving Negroes of external opportunities cultural, economic, and political the Court has now added the less conspicuous but perhaps even more important psychic results as constitutionally significant factor. The great achievement of Justice Brandeis, decade before he joined the Court, in winning approval for maximum hours legislation by educating his future colleagues to the economic facts of life has been extended by his successors to another discipline in the social sciences. Education, Chief Justice Warren wrote, is today a principal instrument in awakening the child to cultural values . . . and in helping him to adjust normally to his environment. But if normal adjustment to the environment is function of education, the educational environment itself must be built on democratic norms or serve to produce undemocratic personalities of type better suited to an authoritarian than free society. Whatever may have been the extent of psychological knowledge at the time the separate but fiction was established, the Court now holds that segregation generates in the minority a feeling of inferiority as to their status in the community that may affect their habits and minds in way unlikely ever to be undone. As southern attorneys-general prepare briefs to parry the impact of this decision, it is appropriate to ask just how great the psychic costs of segregation are. As professors with different skin pigmentation in Florida's segregated university system (but, more important, as colleagues in the social sciences), the authors of this article have accordingly attempted to measure the degree of authoritarianism implicit in the personality structures of their respective students. Is the Court correct in assuming that segregation permanently marks the personalities of southern Negroes? If so, in what respects? And, of equal significance, what is its comparative effect on the whites? The test of authoritarianism developed in the monumental study of The Authoritarian Personality (T. W. Adorno, Else Frenkel-Brunswik, Daniel J. Levinson, and R. Nevitt Sanford, New York, 1950) by group of California psychologists offered the best tool available for answering these questions. Designed to measure underlying