This chapter examines the issue of the “logic” underlying Hegel’s exposition of the “concept of nature.” Given the systematic structure of Hegel’s Philosophy of Nature, which is positioned between the Logic and the Philosophy of Spirit, the problem of the logic guiding the immanent development of nature’s forms as well as the development of the philosophical cognition of them is, in Hegel’s view, a particularly relevant one. At the center of this chapter is the question of whether the “logic of nature” is the same logic presented in the first systematic division of Hegel’s philosophy or rather a modified variant of such a logic. The logic of nature, it argues, combines the determinations of pure speculative thinking (or the determinations of the “absolute idea”) with the specific conditions offered by the concept and by the reality of nature. Crucial to this logic is, first, Hegel’s famous definition of nature as the “idea in the form of otherness.” Such a definition obtains from the end of the Logic, which is be examined in detail, and followed through some crucial passages from the Philosophy of Nature. This chapter follows the development of the logic of nature between two extremes – the “absolute idea” and “spirit” – and concludes with a brief examination of the three syllogisms with which Hegel crowns his encyclopedic system.