The passage from “Logic” to “Nature” is carried out in Hegel's Encyclopedia of the Philosophical Sciences, a work first published in 1817 as he assumed his duties as a professor in Heidelberg (his first position as a professor to carry a salary with it). The Encyclopedia was Hegel's first published statement of his long-awaited “system,” and it went through various editions during his lifetime, swelling in size and scope each time it was revised and reprinted. It is structured very architectonically, having three “books” (Logic, Philosophy of Nature, Philosophy of Spirit), and each of those is structured (generally) around a triad of subordinate notions. He also published two independent books that elaborated on the much shorter presentations found in the Encyclopedia (both the Logic and the Philosophy of Right were longer versions of material found in shorter form in the Encyclopedia, even if the Logic actually appeared first). At first, Hegel continued to count the Phenomenology as the introduction to this system, but, shortly before his death, he announced in a footnote to a new edition of his Logic that the introductory sections of the Encyclopedia were henceforth to be taken as the true “introduction”; he did not elaborate on what status the older, 1807 Phenomenology was supposed to have (a move that has kept commentators busy ever since).