I / Philosophy of Science.- I. A Picture Theory of Theory-Meaning.- II. On Elementary Particle Theory.- III. Some Philosophical Aspects of Contemporary Cosmologies.- IV. Stability Proofs and Consistency Proofs: A Loose Analogy.- II / History of Science.- V. Leverrier: The Zenith and Nadir of Newtonian Mechanics.- VI. The Contributions of Other Disciplines to 19th Century Physics.- III / General Philosophy.- VII. On Being in Two Places at Once.- VIII. Copernicus' Rôle in Kant's Revolution.- IX. It's Actual, so It's Possible.- X. On Having the Same Visual Experiences.- XI. Mental Events Yet Again: Retrospect on Some Old Arguments.- IV / Logic.- XII. Imagining the Impossible.- XIII. On the Impossibility of Any Future Metaphysics.- XIV. Good Inductive Reasons.- XV. A Budget of Cross-Type Inferences, or Invention is the Mother of Necessity.- XVI. The Irrelevance of History of Science to Philosophy of Science.- XVII. The Idea of a Logic of Discovery.- V / Religion.- XVIII. The Agnostic's Dilemma.- XIX. What I Don't Believe.- VI / The Theory Of Flight.- Introduction, by Edward MacKinnon, S.J..- XX. Lecture One: The Discovery of Air.- XXI. Lecture Two: The Shape of An Idea.- XXII. Lecture Three: The Idea of a Shape.