1 Two recent discussions of this issue are, however, overlooked by Sacks. First, there is no mention of Foster, John, The Case for Idealism (London: Routledge & Kegan Paul, 1982).Google Scholar A more serious omission is the lack of a discussion of Michael Dummett's suggestion that metaphysical debates are, at root, debates about the sort of meaning possessed by various classes of sentences.

2 David Hume, Treatise, Book I, Part IV, Section II.

3 Carnap, Rudolf, “Empiricism, Semantics, and Ontology,” Revue Internationale de philosophie, 11 (1950); 20–40.Google ScholarQuine, W. V. O., “On Carnap's Views on Ontology,” in his The Ways of Paradox and Other Essays (Cambridge, MA: Harvard University Press, 1976), p. 203–11Google Scholar.