S. attacks Russell's view that the sentence 'The king of France is wise' is false if uttered at a time when there is no King of France. S.'s position: if somebody uses the definite description 'the King of France' in a uniquely referring way, then the presumption (presupposition) is that he thinks that there is some individual of the kind described and that the context will sufficiently determine which one he has in mind; thus the use of 'the' in that way implies (but does not assert) that the individual referred to exists; if an utterance fails to satisfy that existential condition, then it has no truth value at all.