The Trouble with Natural Kinds: Kripke’s Version, Part 2

In this post, I argued that, contra Kripke, when the baptismal origin of a natural kind term has none of the properties we associate with that term, the term no longer refers to a kind that includes its baptismal origin. I then promised that I argue that, when objects not “of the same kind” (in a realist sense) as the baptismal origin of a natural kind term have all of the properties associated with a kind term, the kind term does (or at least, Kripke didn’t show that it doesn’t) include those objects in its extension. Here’s where I’ll do that.

Kripke’s Original Argument

Kripke’s example is as follows: Consider English as it was spoken pre-Lavoisier. The term “water,” at that point, clearly did not have associated with it the property of having the chemical formula H2O. The set of properties associated with it, at most, involved those properties accessible to people at the time. Now, suppose there was another compound (which Kripke calls XYZ), such that it had all of the properties of water that were accessible to people before the start of modern chemistry.

Kripke takes it as obvious (and I’m pretty much inclined to agree) that XYZ shouldn’t count as water. But should it count as water as the term was used before the start of modern chemistry? Kripke thinks that’s pretty obvious, too. Of course, he claims, the meaning of “water” hasn’t actually changed since the 17th century. So XYZ couldn’t have counted as “water” then, either, even though it had all the properties that were associated with the term.

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The Trouble with Natural Kinds: Kripke’s Version

Unlike my attack on Quine’s argument for natural kinds realism, my problems with Kripke’s natural kinds realism did make it into my dissertaion. My focus there wasn’t on natural kinds; it was, instead, on Kripke’s general theory of non-connotativity of certain terms (and natural kind terms are among them). But, at least for Kripke, non-connotativity of natural kind terms and natural kinds realism are closely tied, so the same argument will do for both. For those of you who aren’t terribly excited about the idea of looking up my dissertation, I’ll put a somewhat abridged version of my argument here.

Kripke’s Original Argument

Kripke’s argument for natural kinds realism is, essentially, this: We don’t specify, through anything like definition, the extensions of our natural kind terms. For example (his example), there’s no set of concepts associated with the term “tiger” that uniquely picks out all and only tigers. Indeed, tigers could turn out to have none of the attributes associated with our concepts of them. Although they, for example, appear to eat meat, be related to cats, and be striped, these could (though it’s exceptionally implausible–it’s not impossible, and that’s all he needs) turn out to have none of these attributes. The apparent relation to cats could be a result of our inadequate understanding of genetics, the stripedness could be an optical illusion, and the meat-eating could in fact be something very different (perhaps–remember, we’re allowing the implausible here–tigers’ claws convert the creatures they kill into 100% textured tofu, so they never consume an iota of meat).

(Kripke has another argument, about water, that goes in the other direction–that something can have all the properties we conceptually associate with a kind without being a member of the kind.  I’ll cover that in a separate post.)

How do natural kind terms get their extensions? Well, Kripke wants to present, as opposed to a conceptual model, a causal model. The initial referent of “tiger” (or, more likely, some linguistic ancestor of “tiger”) was a tiger because of something that Kripke called a “baptismal event”–generally an ostention (“I shall call that thing [pointing] a tiger”) but possibly an *initial* description (“I shall call the creature that mauled this water buffalo a tiger”). At any rate, in all likielihood, this baptismal event picked out only a single object, or possibly a small number of objects. The relationship of that term  to other tigers is that other tigers are part of the same natural kind. The extent of that natural kind is a scientific fact to be discovered, not a definitional one to be stipulated. And the relationship of our term “tiger” to tigers is that there’s the right sort of “causal chain” between the initial term’s usage and our current usage of “tiger.”

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That Rabbit Won’t Go Back in the Hat

Occasionally I’m just going to post about random ideas that are buzzing around in the back of my head. I’ve got three of them going right now: One related to technology, one related to economics, and one–the one I’m going to post here–related to my old field, philosophy, in particular, metaphysics and the philosophy of language.

In particular, I want to look at the premise set forth by Nathan Salmon’s Reference and Essence. Salmon was looking at a pair of theories often taken to be related (though Salmon’s argument was that they weren’t; not really)–the baptismal theory of names, and essentialism. Kripke, famously, proposed the baptismal theory of names in his Naming and Necessity, and had drawn essentialism as a conclusion from it; this step was accepted by much of the philosophy of language community. Salmon wasn’t interested in whether the baptismal theory of names (or, for that matter, essentialism) was accurate or not; he was simply trying to argue that the latter did not follow from the former.

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