Free library of primary texts

Biology

• An Anatomical Disquisition on the Motion of the Heart and Blood in Animals by William Harvey (1628)
• An Essay on the Principle of Population by Thomas Robert Malthus (1798)
• Darwinism: An Exposition of the Theory of Natural Selection by Alfred Russel Wallace (1889)
• Essays Upon Heredity and Kindred Biological Problems by August Weismann (1889)
• Evidence as to Man's Place in Nature by Thomas Henry Huxley (1863)
• Evolution and Ethics, and Other Essays by Thomas Henry Huxley (1893)
• Mendel's Principles of Heredity: A Defence by William Bateson (1902)
• Micrographia by Robert Hooke (1665)
• On the Origin of Species by Charles Darwin (1859)
• Studies on Fermentation by Louis Pasteur (1876)
• The Descent of Man, and Selection in Relation to Sex by Charles Darwin (1871)
• The Expression of the Emotions in Man and Animals by Charles Darwin (1872)
• The Natural History of Selborne by Gilbert White (1789)
• The Naturalist on the River Amazons by Henry Walter Bates (1863)
• The Riddle of the Universe at the Close of the Nineteenth Century by Ernst Haeckel (1899)
• The Voyage of the Beagle by Charles Darwin (1839)

Mathematics

• A Budget of Paradoxes, Volume I by Augustus De Morgan (1872)
• A Budget of Paradoxes, Volume II by Augustus De Morgan (1872)
• A Philosophical Essay on Probabilities by Pierre-Simon Laplace (1814)
• Amusements in Mathematics by Henry Ernest Dudeney (1917)
• Archimedes by Thomas Little Heath (1920)
• Flatland: A Romance of Many Dimensions by Edwin Abbott Abbott (1884)
• Passages from the Life of a Philosopher by Charles Babbage (1864)
• The Commentaries of Proclus on the First Book of Euclid's Elements by Proclus (450)
• The Foundations of Science by Henri Poincaré (1913)
• The Game of Logic by Lewis Carroll (1886)
• The Hindu-Arabic Numerals by David Eugene Smith (1911)
• The Logic of Chance by John Venn (1866)
• The Principles of Science: A Treatise on Logic and Scientific Method by William Stanley Jevons (1874)

Philosophy

• A Treatise Concerning the Principles of Human Knowledge by George Berkeley (1710)
• A Vindication of the Rights of Woman by Mary Wollstonecraft (1792)
• An Enquiry Concerning Human Understanding by David Hume (1748)
• Apology by Plato
• Beyond Good and Evil by Friedrich Nietzsche (1886)
• Confessions by Augustine of Hippo (400)
• Crito by Plato
• Discourse on Method by René Descartes (1637)
• Essays, First Series by Ralph Waldo Emerson (1841)
• Ethics by Baruch Spinoza (1677)
• Fear and Trembling by Søren Kierkegaard (1843)
• Fundamental Principles of the Metaphysic of Morals by Immanuel Kant (1785)
• Gorgias by Plato
• Leviathan by Thomas Hobbes (1651)
• Meditations by Marcus Aurelius (180)
• On Liberty by John Stuart Mill (1859)
• On the Duty of Civil Disobedience by Henry David Thoreau (1849)
• On the Shortness of Life by Seneca (49)
• Phaedo by Plato
• Phaedrus by Plato
• Poetics by Aristotle
• Politics by Aristotle
• Pragmatism by William James (1907)
• Second Treatise of Government by John Locke (1689)
• Studies in Pessimism by Arthur Schopenhauer (1851)
• Tao Te Ching by Laozi
• The Analects by Confucius
• The Antichrist by Friedrich Nietzsche (1895)
• The Bhagavad Gita by Vyasa
• The Critique of Pure Reason by Immanuel Kant (1781)
• The Dhammapada by The Buddha
• The Discourses by Epictetus (108)
• The Enchiridion by Epictetus (125)
• The Essays by Francis Bacon (1597)
• The Genealogy of Morals by Friedrich Nietzsche (1887)
• The Nicomachean Ethics by Aristotle
• The Prince by Niccolò Machiavelli (1532)
• The Problems of Philosophy by Bertrand Russell (1912)
• The Republic by Plato
• The Social Contract by Jean-Jacques Rousseau (1762)
• The Subjection of Women by John Stuart Mill (1869)
• The Symposium by Plato
• The Varieties of Religious Experience by William James (1902)
• Thus Spake Zarathustra by Friedrich Nietzsche (1883)
• Utilitarianism by John Stuart Mill (1863)
• Utopia by Thomas More (1516)
• Walden by Henry David Thoreau (1854)

Physics

• A Discourse Concerning the Natation of Bodies in Water by Galileo Galilei (1612)
• Experimental Researches in Electricity, Volume 1 by Michael Faraday (1839)
• Five of Maxwell's Papers by James Clerk Maxwell
• Opticks: A Treatise of the Reflections, Refractions, Inflections and Colours of Light by Isaac Newton (1704)
• Radio-Active Substances by Marie Curie (1903)
• Radio-Activity by Ernest Rutherford (1904)
• Reflections on the Motive Power of Heat by Sadi Carnot (1824)
• Relativity: The Special and General Theory by Albert Einstein (1916)
• Six Lectures on Light by John Tyndall (1873)
• Stars and Atoms by Arthur Stanley Eddington (1927)
• The Chemical History of a Candle by Michael Faraday (1861)
• The Einstein Theory of Relativity: A Concise Statement by Hendrik Antoon Lorentz (1920)
• The Origin and Development of the Quantum Theory by Max Planck (1922)
• The Principle of Relativity by Albert Einstein (1920)
• The Sidereal Messenger by Galileo Galilei (1610)
• Treatise on Light by Christiaan Huygens (1690)

Politics

• An Inquiry into the Nature and Causes of the Wealth of Nations by Adam Smith (1776)
• Common Sense by Thomas Paine (1776)
• Democracy in America, Volume 1 by Alexis de Tocqueville (1835)
• Democracy in America, Volume 2 by Alexis de Tocqueville (1840)
• God and the State by Mikhail Bakunin (1882)
• Narrative of the Life of Frederick Douglass, an American Slave by Frederick Douglass (1845)
• Rights of Man by Thomas Paine (1791)
• Speech on Conciliation with America by Edmund Burke (1775)
• The Communist Manifesto by Karl Marx (1848)
• The Condition of the Working-Class in England in 1844 by Friedrich Engels (1845)
• The Conquest of Bread by Peter Kropotkin (1892)
• The Federalist Papers by Alexander Hamilton (1788)
• The Law by Frédéric Bastiat (1850)
• The Republic of Cicero by Marcus Tullius Cicero
• Thoughts on the Present Discontents, and Speeches by Edmund Burke (1770)
• What Is Property? by Pierre-Joseph Proudhon (1840)

Psychology

• A Beginner's Psychology by Edward Bradford Titchener (1915)
• A General Introduction to Psychoanalysis by Sigmund Freud (1917)
• An Introduction to Psychology by Wilhelm Wundt (1911)
• Animal Intelligence: Experimental Studies by Edward L. Thorndike (1911)
• Collected Papers on Analytical Psychology by Carl Gustav Jung (1916)
• Dream Psychology: Psychoanalysis for Beginners by Sigmund Freud (1920)
• Elements of Folk Psychology by Wilhelm Wundt (1912)
• Inquiries into Human Faculty and Its Development by Francis Galton (1883)
• Psychology and Industrial Efficiency by Hugo Münsterberg (1913)
• Psychology of the Unconscious by Carl Gustav Jung (1912)
• Psychology: An Elementary Text-book by Hermann Ebbinghaus (1908)
• The Crowd: A Study of the Popular Mind by Gustave Le Bon (1895)
• The Group Mind by William McDougall (1920)
• The Mind and the Brain by Alfred Binet (1905)
• The Psychology of the Emotions by Théodule Ribot (1896)
• Youth: Its Education, Regimen, and Hygiene by G. Stanley Hall (1906)

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