1. Russell's Version of the Theory of Definite Descriptions -- 2. Existential Import, 'E!' and 'The' -- 3. The Reduction of Two Paradoxes and the Significance Thereof -- 4. The Hilbert-Bernays Theory of Definite Descriptions -- 5. Foundations of the Hierarchy of Positive Free Definite Description Theories -- 6. Predication and Extensionality -- 7. Nonextensionality -- 8. The Philosophical Foundations of Free Logic -- 9. Logical Truth and Microphysics.