Philosophical books

This is a list of some of the many philosophical books that are now in the public domain and can be browsed or downloaded (in PDF format) from Google’s archive. You can find more by searching at http://books.google.com/ and selecting “Full view books.”

Philosophy of mathematics

Gottlob Frege, Die Grundlagen der Arithmetik: Eine logisch mathematische Untersuchung ueber den Begriff der Zahl (1884)

David Hilbert, The Foundations of Geometry, translated by E. J. Townsend (1902)

Bertrand Russell, The Principles of Mathematics (1903)

Bertrand Russell, An Essay on the Foundations of Geometry (1897)

Albert Einstein, Geometrie und Erfahrung (1921)

Henri Poincaré, The Foundations of Science (Science and Hypothesis, The Value of Science, Science and Method), trans. Halsted (1913)

Logic

Gottlob Jäsche, Immanuel Kants Logik: Ein Handbuch zu Vorlesungen (1800)

Henry Longueville Mansel, Prolegomena Logica: An Inquiry into the Psychological Character of Logical Processes (1860)

C. S. Peirce, Description of a Notation for the Logic of Relatives, Resulting from an Amplification of the Conceptions of Boole’s Calculus of Logic (1870)

Alexander Bain, Logic: Deductive and Inductive (1887)

Hermann Lotze, Logic, Vol. I, translated by Bernard Bosanquet (1888)

Hermann Lotze, Logic, Vol. II, translated by Bernard Bosanquet (1888)

Christoph Sigwart, Logic, Vol. I, translated by Helen Dendy (1895)

John Venn, The Logic of Chance: An Essay on the Foundations and Province of the Theory of Probability (1896)

Alfred Tarski, Introduction to Logic and to the Methodology of Deductive Sciences, translated by Olaf Helmer

Ethics

John Stuart Mill, The Subjection of Women (1870)

John Stuart Mill, Utilitarianism (1887)

Henry Sidgwick, The Methods of Ethics, 4th ed. (1890)

Metaphysics and Epistemology

John Stuart Mill, Auguste Comte and Positivism, 4th ed. (1891)

F. H. Bradley, Principles of Logic (1883)

History of Philosophy

James Adam, The Republic of Plato (1902)

Fun

Edwin Abbott, Flatland: A Romance of Many Dimensions, by A. Square, with Illustration by the Author (1899)

Lewis Carroll, Through the Looking Glass (1897)