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. Copernicusโ{128}{153} Rรดle in Kantโ{128}{153}s Revolution -- IX. Itโ{128}{153}s Actual, so Itโ{128}{153}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 Agnosticโ{128}{153}s Dilemma -- XIX. What I Donโ{128}{153}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