By giving the proper emphasis to both radical skepticism and naturalism as two independent standpoints in Hume, I wish to propose a more satisfactory account of some of the more puzzling Humean claims on causation. I place these claims alternatively in either the philosophical standpoint of the radical skeptic or in the standpoint of everyday and scientific beliefs. I characterize Hume’s radical skeptical standpoint in relation to Hume’s perceptual model of the traditional theory of ideas, and I argue that Hume‘s radical skeptical argument concerning our causal inferences is inextricably linked to his skeptical argument concerning our idea of a necessary connection between cause and effect. I discuss Hume’s naturalistic account of the origin of our idea of necessity and offer a new reading of Hume’s two “definitions” of cause. I argue along the way against central aspects of two opposing styles of interpretation---Norman Kemp Smith’s and Annette Baier’s, on the one hand, and Robert Fogelin’s, on the other---that in my view do not appreciate the mutual autonomy of radical skepticism and naturalism in Hume.

Kant has long been taxed with an inability to explain the detailed normative content of our lives by making universalizability the sole arbiter of our values. Korsgaard addresses one form of this critique by defending a Kantian theory amended by a seemingly attractive conception of practical identities. Identities are dependent on the contingent circumstances of each person's world. Hence, obligations issuing from them differ from Kantian moral obligations in not applying to all persons. Still, Korsgaard takes Kantian autonomy to mean the normativity of all obligations is rooted in universalizability. The wealth of values informing our lives is thus said to be accommodated within a Kantian framework.After briefly explaining Korsgaard’s understanding of practical identities and their role in her reformation of Kant's moral philosophy, I argue that she gives an inadequate explanation of how the obligations that arise from a person’s practical identities derive their authority from the person's will. I then consider how her position might be developed to meet this objection in accordance with her allegiance to “constructivism” and I argue that the epistemic commitments of people’s actual identities makes it unlikely that such a development could preserve Kantian autonomy as she interprets it.

In this paper I discuss the claim (advanced in various ways by Joseph Levine, Frank Jackson and David Chalmers) that the successful reduction of qualitative to physical states requires some sort of intelligible connection between our qualitative and physical concepts, which in turn requires a conceptual analysis of our qualitative concepts in causal-functional terms. While I defend this claim against some of its recent critics, I ultimately dispute it, and propose a different way to get the requisite intelligible connection between qualitative and physical concepts.