Sociological ambivalence (with E. Barber).--The ambivalence of scientists.--The ambivalence of scientists, a postscript.--The ambivalence of physicians.--The ambivalence of organizational leaders.--Dilemmas in voluntary associations.--Structural analysis in sociology.--The unanticipated consequences of social action.--Social knowledge and public policy.--The canons of the anti-sociologist.--Discrimination and the American creed.--Intermarriage and the social structure.--Fact and factitiousness in ethnic opinionnaires.