Hegel’s “natural philosophy” is an extension of his overall systematic project having to do with a post-Kantian philosophy that did not rely on Kant’s conception of “pure intuitions.” Instead, Hegel proposed a Logic that as an internally self-enclosed system of pure thoughts required to make sense of making sense. Famously, he concluded his Logic with some not entirely clear ideas about the need to move from it to a Naturphilosophie, a move which he somewhat puzzlingly said was not itself a further logical “transition.” Hegel also defends a non-empiricist study of nature, that is, an explanation not merely in terms of empirically determined regularities, for all such regularities, although existent, are not fully “actual” in that they are not what is doing the real work of explanation. What explains the regularities themselves are the various pure objects of the Naturphilosophie which are involved in working out what “external to pure thought” would mean: the mechanical, the physical, the chemical, and the biological fields of nature, each of which manifests a power (Potenz) that explains why the empirically found regularities in nature actually hold. This chapter suggests that the reason for the transition from Logic to Nature is that pure thought on its own is powerless, and that this has implications for how we think of Hegel’s system as a whole.

The Introduction discusses why, to draw out a genuinely critical social theory from Hegel’s thought, we must turn away from his official social and political philosophy in the Philosophy of Right, and instead use the logic of essence in the Science of Logic. The logic of essence, I suggest, does not present a historically invariant ontology, but sets out an ontology that is specific to capitalism. Finally, I introduce the central thesis of the book, namely, that the categories of the logic of essence give expression to the general structure of social domination in capitalism.