This book discusses and analyzes the many different procedures of inquiry, both old and new, which have been used in an attempt to solve the problems men encounter. Section A examines some outmoded procedures of inquiry, describes scientific inquiry, and presents the Dewey-Bentley view of scientific method. Sections B and C, which comprise the major portion of the book, present Joseph Ratner's essay, "Introduction to John Dewey's Philosophy," and the full text of John Dewey's and Arthur Bentley's book, "Knowing and the Known." Both of these documents are no longer available from other sources. Section D contains critical analyses of recent inquiries in the behavioral field. (Author/RM)