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This paper challenges the Kripkean interpretation of a posteriori necessities. It will be demonstrated, by an analysis of classic examples, that the modal content of supposed a posteriori necessities is more complicated than the Kripkean line suggests. We will see that further research is needed concerning the a priori principles underlying all a posteriori necessities. In the course of this analysis it will emerge that the modal content of a posteriori necessities can be best described in terms of a Finean conception of modality – by giving essences priority over modality. The upshot of this is that we might be able to establish the necessity of certain supposed a posteriori necessities by a priori means.

After a brief review of the notions of necessity and a priority, this paper scrutinizes Kripke's arguments for supposedly contingent a priori propositions and necessary a posteriori propositions involving proper names, and reaches a negative conclusion, i.e. there are no such propositions, or at least the propositions Kripke gives as examples are not such propositions. All of us, including Kripke himself, still have to face the old question raised by Hume, i.e. how can we justify the necessity and universality of general statements on the basis of sensory or empirical evidence?

The “scientific essentialist” doctrine asserts that the following are examples of a posteriori necessary identities: water is H2O; gold is the element with atomic number 79; and heat is the motion of molecules. Evidence in support of this assertion, however, is difficult to find. Both Hilary Putnam and Saul Kripke have argued convincingly for the existence of a posteriori necessities. Furthermore, Kripke has argued for the existence of a posteriori necessary identities in regard to a particular class of statements involving proper names. Neither Kripke nor Putnam, however, has argued convincingly that sentences containing syntactically complex terms or descriptive phrases can express a posteriori necessary identities. I will argue by way of a hypothetical example that ‘water is H2O’ does not express a necessary identity. My argument is unique in that it attacks the relevant sufficiency claim needed to underwrite this putative necessary identity.1 That is, even if we grant that water is necessarily composed of H2O, we should not accept that H2O necessarily forms water.

We think that Kripke’s arguments that there are contingent a priori truths and that there are necessary a posteriori truths about named and essentially described entities fail. They fail for the reasons that there are ambiguities in each of the three eases. In the first ease, what is known apriori is not what is contingent. In the latter two cases, what is necessary or essential is not what is known a posteriori.

_the a priori role_ (for word T). For instance, perhaps anyone who understands the word _water_ is able to know, without appeal to any further a posteriori information, that _water_ refers to the clear, drinkable natural kind whose instances are predominant in our oceans and lakes (if _water_ refers at all.

Machine generated contents note: Introduction Alan Berger; Part I. Naming, Necessity, Identity, and A Priority: 1. Kripke on proper and general names Bernard Linsky; 2. Kripke on vacuous names and names in fiction Nathan Salmon; 3. Kripke on epistemic and modal possibility: two routes to the necessary a posteriori Scott Soames; 4. Possible world semantics and its philosophic foundations Robert Stalnaker; Part II. Formal Semantics, Truth, Philosophy of Math, and Philosophy of Logic: 5. Kripke models for modal logic and intuitionism John Burgess; 6. Kripke's theory of truth John Burgess; 7. Kripke on logicism, Wittgenstein, and de re beliefs about numbers Mark Steiner; 8. Kripke on the incoherency of adopting a logic Alan Berger; Part III. Language and Mind: 9. Kripke's new puzzle about belief and our principles of belief attribution Mark Richard; 10.; A note on Kripke's puzzle about belief Nathan Salmon; 11. Kripke's version of Wittgenstein: some conceptions and misconceptions George Wilson; 12. Kripke on color words and the primary, secondary quality distinction Mario Gomez-Torrente; Part IV. Philosophy of Mind and Philosophical Psychology: 13. Kripke's views on carteisianism and naturalism Sydney Shoemaker; 14. Kripke's critique of functionalism Jeff Buechner.

Applying two-dimensional modal semantics, some philosophers, most recently Frank Jackson and David Chalmers among others, have sought to provide analyses of Kripke’s examples of the necessary a posteriori. Despite the massive amount of attention that two-dimensionalism has received of late, Robert Nozick’s recent accounting of Kripke’s examples, which bears striking similarities to these two-dimensionalist analyses but reached a different conclusion, has gone unnoticed. This paper argues that (a) underlying such a difference is a serious problem with the two-dimensionalist approach to the necessary a posteriori and (b) thinking through this problem will go a long way towards a proper understanding, and thus assessment, of this approach.

The essence of the associated-proposition strategy is to distinguish the necessary proposition _expressed by_ a sentence.