Nicholas Rescher was born in Germany in 1928 and emigrated to the United States shortly before the outbreak of World War II. After training in philosophy at Princeton University he embarked on a long and active career as professor, lecturer, and writer. His many books on a wide variety of philosophical topics have established him as one of the most productive and versatile contributors to 20th century philosophical thought, combining historical and analytical investigators to articulate an amalgam of German idealism with American pragmatism. The book accordingly has two dimensions, both as a contribution to German-American cultural interaction and as a contribution to the history of philosophical ideas