On the Soul Minor biological works On Sense and the Sensible On Memory and Reminisence On Sleep and Sleeplessness On Dreams On Prophesying by Dreams On Longevity and Shortness of Life On Youth and Old Age, On Life and Death, On Breathing Volume 9 Aristotle History of Animals Parts of Animals On the Motion of Animals On the Gait of Animals On the Generation of Animals Nicomachean Ethics Politics The Athenian Constitution Rhetoric Poetics Volume 10 Hippocrates Works The Hippocratic Oath On Ancient Medicine On Airs, Water, and Places The Book of Prognostics On Regimen in Acute Diseases Of the Epidemics On Injuries of the Head On the Surgery On Fractures On the Articulations Instruments of Reduction Aphorisms The Law The Ulcer On Fistulae On Hemorrhoids On the Sacred Disease Galen On the Natural Faculties Volume 11 Euclid The Thirteen Books of Euclid's Elements Archimedes On the Sphere and Cylinder Measurement of a Circle On Conoids and Spheroids On Spirals On the Equilibrium of Planes The Sand Reckoner The Quadrature of the Parabola On Floating Bodies Book of Lemmas The Method Treating of Mechanical Problems Apollonius of Perga On Conic Sections Nicomachus of Gerasa Introduction to Arithmetic Volume 12 Lucretius On the Nature of Things (translated by H.A.J. Munro) Epictetus The Discourses (translated by George Long) Marcus Aurelius The Meditations (translated by George Long) Volume 13 Virgil (translated into English verse by James Rhoades) Eclogues Georgics Aeneid Volume 14 Plutarch The Lives of the Noble Grecians and Romans (translated by John Dryden) Volume 15 P. Cornelius Tacitus (translated by Alfred John Church and William Jackson Brodribb) The Annals The Histories Volume 16 Ptolemy Almagest, (translated by R. Catesby Taliaferro) Nicolaus Copernicus On the Revolutions of Heavenly Spheres (translated by Charles Glenn Wallis) Johannes Kepler (translated by Charles Glenn Wallis) Epitome of Copernican Astronomy (Books IV–V) The Harmonies of the World (Book V) Volume 17 Plotinus The Six Enneads (translated by Stephen MacKenna and B. S. Page) Volume 18 Augustine of Hippo The Confessions The City of God On Christian Doctrine Volume 19 Thomas Aquinas Summa Theologica (First part complete, selections from second part, translated by the Fathers of the English Dominican Province and revised by Daniel J. Sullivan) Volume 20 Thomas Aquinas Summa Theologica (Selections from second and third parts and supplement, translated by the Fathers of the English Dominican Province and revised by Daniel J. Sullivan) Volume 21 Dante