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PERMISSIONS I am indebted to the following publishing companies, institutions, or persons for permission to quote or reprint materials from the sources indicated: Penguin Books Ltd. for passages from R. E. Latham’s translation of Titus Lucretius Carus’s On the Nature of the Universe; Hackett Publishing Company for the excerpt from Thomas Aquinas, Basic Writings of Saint Thomas Aquinas, vol. 1, ed. by Anton C. Pegis; University of Wisconsin Press for passages from the translation by Albert Menut of Nicole Oresme, Le livre du ciel et du monde, ed. by Albert D. Menut and Alexander J. Denomy, C.S.B.; Green Lion Press, especially to William H. Donahue, for use of his translation of passages from Isaac Newton’s Mathematical Principles of Natural Philosophy; Stanley L. Jaki for passages from his translation of Johann Lambert’s Cosmological Letters on the Arrangement of the World Edifice; Anvil Press for the translation by Sally Purcell of Thomas Gray’s “Luna habitabilis”; Master and Fellows of Trinity College, Cambridge University for the use of John Herschel’s unpublished letter to William Whewell of 1854 and the selections from the letters written to Whewell by James Stephen; Keith Lafortune for his translation of the selection from Auguste Comte’s Cours de philosophie positive; Robert L. Jones, Jr., for the selection from his unpublished translation of Camille Flammarion’s La pluralité des mondes habités; and Dover Publications for passages from Michael J. Crowe’s The Extraterrestrial Life Debate, 1750–1900. To the following publishers or institutions, I am indebted for permission to include the following illustrations: the Royal Astronomical Society for their picture 542 of a portion of William Herschel’s unpublished lunar observation book and their photograph of Eugéne Michael Antoniadi; and the Master and Fellows of Trinity College, Cambridge for the portrait of William Whewell. I also wish to thank Green Lion Press for their assistance in procuring the image of Descartes’ vortices, which also appeared in Michael J. Crowe, Mechanics from Aristotle to Einstein. p e r m i s s i o n s 543 ...

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