Reply to Ezcurdia and Gómez-Torrente

Contra Ezcurdia, it is argued that my thesis —that substitution of coreferential names or indexicals in attitude ascriptions preserves truth values of propositions semantically expressed, although it often changes truth values of propositions asserted— is compatible with the fact that belief ascriptions play important explanatory roles. Contra Gómez-Torrente, it is argued that although single-word natural kind terms are rigid in Kripke's original sense, natural kind predicates containing them are neither rigid nor obstinately essential —in the sense of applying to the same individuals in every possible world-state, whether those individuals exist at the world-state or not.