Bibliographical footnotes. Introduction: What is the critical spirit?--Utopianism, ancient and modern, by M.I. Finley.--Primitive society in its many dimensions, by S. Diamond.--Manicheanism in the Enlightenment, by R.H. Popkin.--Schopenhauer today, by M. Horkheimer.--Beginning in Hegel and today, by K.H. Wolff.--The social history of ideas: Ernst Cassirer and after, by P. Gay.--Policies of violence, from Montesquieu to the Terrorist, by E.V. Walter.--Thirty-nine articles: toward a theory of social theory, by J.R. Seeley.--History as private enterprise, by H. Zinn.--From Socrates to Plato, by H. Meyerhoff.--Rational society and irrational art, by H. Read.--The quest for the Grail; Wagner and Morris, by C.E. Schorske.--ValeÌ#x81;ry; Monsieur Teste, by L. Goldmann.--History and existentialism in Sartre, by L. Krieger.--German popular biographies; culture's bargain counter, by L. Lowenthal.--The Rechtsstaat as magic wall, by O. Kirchheimer.Revolution from above: some notes on the decision to collectivize Soviet agriculture, by E.H. Carr.--Winston Churchill, power politician and counter revolutionary, by A.J. Mayer.--Brahmins and business, 1870-1914; a hypothesis on the social basis of success in American history, by G. Kolko.--On the limits of professional thought, by M.R. Stein.--The limits of integration, by P. Mattick.--The society nobody wants; a look beyond Marxism and liberalism.--Marcuse as teacher, by W. Leiss, J.D. Ober and E. Sherover.--Marcuse bibliography, by W. Leiss, J.D. Ober and E. Sherover (p. 427-433).