12 December 2010 3 350 Report

On FB, the good Elliot Bougis - who is of the Theistical stripe - recently remarked most wittily that “glorying in an immense body.... seems to be the gist of naturalism”. Setting aside the average pop-eyed God-thumping philosophically-not-so-Bright, we can, I think, allow a wry smile at the justesse of his remark – just what *is* it that naturalists embrace?

There are, as my good friend Henry Story recently pointed out, certain problems with the 'individual' that is the unrestricted fusion of 'absolutely everything' - not the least being that as it is every thing, it seems very hard to say that it is any thing (how could we individuate it?). As it contains 'absolutely everything', it should also contain its own complement... David Lewis has even suggested that "the fusion of absolutely everything" is the empty set. All in all, there's a very real problem if we think that naturalism is "about the world-as-a-totality".

I'd rather say that naturalism comprises (1) a certain account of our way of talking about the 'natural world', where "natural world" ranges over a series of integrated systems that found and permit measurement; (2) an epistemological preference for that account over "first principles" drawn from introspection; and (3) a metaphysical preference for extensional, rather than conceptual, ontologies. The *domain* of naturalism is restricted - that is, it certainly isn't Lewis' "unrestricted fusion of absolutely everything". Naturalism ranges, primarily, over those aspects of the physical world that correlate to certain systems of measurement; it therefore approaches aspects of the world susceptible only to vague or to qualitative description using the epistemic criteria of the quantitative approach. Furthermore, ‘naturalist’ theses not only range over ‘physical entities’ – they determine what these entities *are*.

So, there are two ‘branches’ of naturalist metaphysics: one branch considers the relation between physical theory and its putative domain; the other considers the relation between the primary domain of naturalist theory and the domains of other accounts of the world – traditionally, the distinction between the two branches would be illustrated by, on the first branch, the philosophy of physics, and on the second, analytic philosophy of mind [though more recently, developments in post- Lewis philosophy of time have underlined the blurring between these distinctions].

The conflicts between naturalism and doxastic systems are also of two kinds: those that concern the domain of physical theory (Darwinism, creationism...), and those that concern the relation between the domain of naturalist theory and other domains (the relation between the ‘natural’ and the ‘supernatural’; between intention, action, and the evaluation of action; between physical existence and reality...). The former are primarily epistemic conflicts (between rival theories of human origins, rival cosmologies...); the latter are more ‘’metaphysical’ insofar as they concern the limits of reduction of ‘non-physical’ to ‘physical’ domains, and the advisability of eliminating the one in favour of the other. As philosophers, I doubt very much that we would differ greatly over the epistemic value of most of predictive science with respect to “physical reality”, though we would probably disagree over what this epistemic and predictive values signifies. Our wider differences concern the relation of the domain of naturalist theory to other domains and, perhaps most fundamentally, our chances of founding any ‘universal’ standard by which we can evaluate conflicting theories. As far as I can see, choosing naturalism is choosing to live with unresolved indetermination; the challenge for naturalism is to integrate this.

So, unless they’re going to embrace the *theoretical limits of measurement of spacetime in however many dimensions we can fit it into with respect to the entire phase space of every point AND simultaneously of every theory-dependent particle (allowing for the apparent impossibility of defining the precise state and position of any such particle)*, the only body that naturalists can embrace is a body of symbols.

Well, that’s naturalism from the point of view of this nominalist, at any rate... I’ll let others be realist about science.

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