In Part I, we presented and motivated a new formulation of Humean Supervenience about Laws of Nature (HS). Here in Part II, we present an epistemological argument in defense of HS, thus formulated. Our contention is that one can combine a modest realism about laws of nature with a proper recognition of the importance of empirical testability in the epistemology of science only if one accepts HS.

This the first part of a two‐part article in which we defend the thesis of Humean Supervenience about Laws of Nature (HS). According to this thesis, two possible worlds cannot differ on what is a law of nature unless they also differ on the Humean base. the Humean base is easy to characterize intuitively, but there is no consensus on how, precisely, it should be defined. Here in Part I, we present and motivate a characterization of the Humean base that, (...) we argue, enables HS to capture what is really stake in the debate, without taking on extraneous commitments. “I tend to picture the [facts of the form “it is a law that s” and “is is not a lw that s”] as having been sprinkled been sprinkled like powdered sugar over the doughy surface of the non‐nomic facts.”—Marc Lange2 “Avoid empty carbohydrates.”—Runner's World3. (shrink)

In recent work on the foundations of statistical mechanics and the arrow of time, Barry Loewer and David Albert have developed a view that defends both a best system account of laws and a physicalist fundamentalism. I argue that there is a tension between their account of laws, which emphasizes the pragmatic element in assessing the relative strength of different deductive systems, and their reductivism or funda- mentalism. If we take the pragmatic dimension in their account seriously, then the laws (...) of the special sciences should be part of our best explanatory system of the world, as well. (shrink)