As he worked on the Jena system, Hegel’s understanding of the nature of logic and its connection with metaphysics underwent changes crucial to his later system. As a result, logic acquired a new and expanded significance for him. This text is thus the key to an understanding of the works of Hegel’s maturity, and to their relation to the major works of Schelling and Fichte that preceded them. Scholars from the universities of Guelph, Lethbridge, McGill, McMaster, Toronto, Trent, and York have prepared this translation, a work of critical analysis in its own right. The introduction by H.S. Harris adds a concrete dimension to Hegel’s abstract categories, showing how, in developing these categories, Hegel was even at this early date thinking deeply about the structure and life of society.