1. S. Kripke, ?Naming and Necessity?, in D. Davidson and G. Harman (eds.), Semantics of Natural Language (Dordrecht, 1972), pp. 312?314.
2. For one account of this distinction, see Michael Dummett, ?What is a theory of meaning? (II)?, in: Truth and Meaning, ed. by Evans and McDowell (Oxford 1976), p. 89.
3. See D. Parfit, ?Lewis, Perry and What Matters?, in: The Identities of Persons, ed. by A. O. Rorty (California, 1976), pp. 91?107, esp. footnote 18.
4. This argument was suggested to me by J. L. Mackie.
5. See. J. L. Mackie, ?De what re is de re modality??, in: Journal of Philosophy 71 (1974), p. 560.