This volume contains selections from the Principles of Philosophy of Rene Descartes. This volume was translated by John Veitch, LL.D., late Professor of Logic and Rhetoric in the University of Glasgow. This volume contains a letter of the author to the French translator of the Principles of Philosophy serving for a Preface and a letter to the most serene princess, Elizabeth, eldest daughter of Frederick, King of Bohemia, Count Palatine, and Elector of the Sacred Roman Empire.