The present essays is, in large part, a chronicle of John Dewey's ideas on the nature of inquiry and related subjects. It is therefore a study of an intellectual conversion Dewey's shift from idealism to instrumentalism. The theme is not a new one. Everyone familiar with Dewey's writings knows that he started his career as an idealist. What is less known, and less discussed, is the effect this early attachment had upon his subsequent logical views. Lotze, Wundt, Bradley, Green and Bosanquet were the logicians whose work Dewey praised in his earliest years of philosophical writing. There are no papers in which subtle distinctions are made between them or detailed points in idealist logic discussed. Dewey simply praised them as a school, a school of logicians concerned with the method of scientific thinking.