This volume, comprising Supplementary v.23 (1997) of the Canadian Journal of Philosophy, presents eight new essays by contemporary philosophers of language. It covers skepticism about meaning and reference, vagueness, rigid designation, de re belief, pronominal anaphora, Quinean objections to quanti.

If α and α’ are distinct variables and ϕ and ϕ’ are open sentences of some language, where ϕ’ is the result of replacing one or more free occurrences of a in α with free occurrences of α’ in ϕ’, then a universal closure of ⌜)⌝, is an indiscernibility principle of that language. For instance, is an indiscernibility principle.The existence of opaque constructions falsifies the familiar unrestricted principle of substitution which affirms that co-referential expressions are intersubstitutable in all contexts without (...) change of truth-value. But indiscernibility principles are another matter. Not every counter-example to the unrestricted principle of substitution is a counter-example to some indiscernibility principle. Indeed, it is likely to be thought that there is no counter-example to any indiscernibility principle, and that the semantics of variables and objectual quantification ensures that all indiscernibility principles are true. (shrink)