 In “Meaning and Ostensive Definition”, C. H. Whiteley takes it as a premiss that ostensive definitions are “the means whereby men learn the meanings of most, if not all, of those elementary expressions in their language in terms of which other expressions are defined.” (332) It should be noted, however, that nothing in the logic and semantics of ostensive definitions warrants a foundationalist picture of concepts or of language-learning. Such foundationalist pictures were decisively criticized by Ludwig Wittgenstein in his Philosophical Investigations. Wittgenstein’s positive views on ostensive definition remain elusive, however; for an interpretation, see Hacker 1975.