Preface, by E. A. Tiryakian.--Lessons from Sorokin, by A. K. Davis.--Some problems for a unified theory of human nature, by M. J. Levy, Jr.--Christianity and modern industrial society, by T. Parsons.--Sociological dilemmas: five paradoxes of institutionalization, by T. F. O'Dea.--Sociological...