 In this recent work, the principle of tolerance has attracted the most attention. Previously, the rejection of meaning and insistence on the formal, rather than the material, mode of speech had been in the foreground since, after all, the entire philosophical Part V of the book had been devoted to it, and Quine had reinforced that emphasis. It is fair to say that the principle of tolerance taken by itself—unlike the notion of analyticity or theses of conventionalism (see the supplement  Carnap vs Quine on the Analytic-Synthetic Distinction)—was  hardly discussed before its present, belated reception in the Carnap literature. It is a new idea on the philosophical scene today, whose consequences are still being digested.