Preface; Introduction; Part I. Geometry, Relativity, and Convention: 1. Moritz Schlick's Philosophical Papers; Postscript: general relativity and General Theory of Knowledge; 2. Carnap and Weyl on the foundations of geometry and relativity theory; 3. Geometry, convention, and the relativized a priori: Reichenbach, Schlick and Carnap; 4. Poincaré's conventionalism and the logical positivists; Part II. Der Logische Aufbau der Welt: 5. Carnap's Aufbau reconsidered; 6. Epistemology in the Aufbau; Postscript: Carnap and the Neo-Kantians; Part III. Logico-Mathematical Truth: 7. Analytic truth in Carnap's Logical Syntax of Language; 8. Carnap and Wittgenstein's Tractatus; 9. Tolerance and analyticity in Carnap's philosophy of mathematics; Bibliography; Index.