Scientific realism is the view that one can be justified in believing, of some theory about unobservable entities, that the entities it posits are real and accurately described by the theory, in the same sense as one can be justified in believing that the theory’s empirical predictions are accurate, and that so to believe is what it means for a scientist to “accept” that theory, because the goal of science is to describe reality, even its unobservable features. The first part (...) is an epistemic claim, whereas the second concerns the rational reconstruction of scientific practice. Together they suggest that evidence justifying scientific acceptance of a theory justifies belief that the unobservable entities it posits are real and as the theory purports them to be. Anti-realism denies ; it holds that claims about unobservables are either unjustified or justified in a different sense from predictions of observations. It also denies ; it maintains that in her scientific work, as rationally reconstructed, a scientist who accepts a claim about unobservables believes that it yields accurate predictions of observables, not that it describes unobservables. (shrink)

Rosenberg has recently argued that explanations supplied by (what he calls) functional biology are mere promissory notes for macromolecular adaptive explanations. Rosenberg's arguments currently constitute one of the most substantial challenges to the autonomy, irreducibility, and indispensability of the explanations supplied by functional biology. My responses to Rosenberg's arguments will generate a novel account of the autonomy of functional biology. This account will turn on the relations between counterfactuals, scientific explanations, and natural laws. Crucially, in their treatment of the laws' (...) relation to counterfactuals, Rosenberg's arguments beg the question against the autonomy of functional biology. This relation is considerably more subtle than is suggested by familiar slogans such as Laws support counterfactuals; accidents don't. (shrink)