Includes letters to Speigelberg from: Hans Reiner, Professor, Freiburg {In German}; Tom Rockmore, Professor, Department of Philosophy, Yale University, New Haven, Connecticut; F.J.V Rintelen, Director, School of Philosophy, University of Southern California, Los Angeles; Linnel Rubinoff, Professor, McLaughlin College,York University, Toronto; David B. Richardson, Department of Languages and Philosophy, Utah State University; Paul Ricoeur, Professor, Divinity School, The University of Chicago; Kurt F. Reinhardt, Department of Foreign Languages, Stanford University, Stanford, California; William Ruddy, Saint Albert's College, Oakland California. Includes letters from Speigelberg to: Paul Ricoeur, Professor, Divinity School, The University of Chicago; Saul Rosenzweig, Professor, Department of Philosophy; P.T. Raju, Professor, The College of Wooster, Wooster, Ohio; Dale Riepe, Professor, Department of Philosophy, State University of New York at Buffalo, New York; Tom Rockmore, Professor, Department of Philosophy, Yale University, New Haven, Connecticut; Nicholas Rescher, Professor, American Philosophical Quarterly, University of Pittsburg; Linnel Rubinoff, Professor, McLaughlin College, York University, Toronto; Hans Reiner, Professor, Freiburg {In German}. Includes a list of participants in Philosophen Kongre? held at Universitat Mainz, August 1, 1948