| Abstraction in the Formation of Concepts | I 1 | Atomism in the Seventeenth Century | I 132 |
| Academic Freedom | I 9 | Authority | I 141 |
| Agnosticism | I 17 | Axiomatization | I 162 |
| Alchemy | I 27 | Baconianism | I 172 |
| Alienation in Christian Theology | I 34 | Balance of Power | I 179 |
| Alienation in Hegel and Marx | I 37 | Baroque in Literature | I 188 |
| Allegory in Literary History | I 41 | Theories of Beauty to the Mid-Nineteenth Century | I 195 |
| Ambiguity as Aesthetic Principle | I 48 | Theories of Beauty .since the Mid-Nineteenth Century | I 207 |
| Analogy in Early Greek Thought | 1 60 | Behaviorism | I 214 |
| Analogy in Patristic and Medieval Thought | I 64 | Biological Conceptions in Antiquity | I 229 |
| Analogy of the Body Politic | I 67 | Biological Homologies and Analogies | I 236 |
| Anarchism | I 70 | Biological Models | I 242 |
| Ancients and Modems in the Eighteenth Century | I 76 | Buddhism | I 247 |
| Anthropomorphism in Science | I 87 | Casuistry | I 257 |
| Antinomy of Pure Reason | I 91 | Catharsis | I 264 |
| Appearance and Reality | I 94 | Causation | I 270 |
| Art and Play | I 99 | Causation in History | I 279 |
| Art for Art's Sake | I 108 | Causation in Islamic Thought | I 286 |
| Association of Ideas | I 111 | Causation in Law | I 289 |
| Astrology | I 118 | Causation in the Seventeenth Century | I 294 |
| Atomism: Antiquity to the Seventeenth Century | I 126 | | |
| Causation in the Seventeenth Century, Final Causes | I 300 | Creativity in Art | I 577 |
| Certainty in Seventeenth-Century Though | I 304 | Crisis in History | I 589 |
| Certainty since the Seventeenth Century | I 312 | Literary Criticism | I 596 |
| Chain of Being | I 325 | Cultural Development in Antiquity | I 607 |
| Chance | I 335 | Culture and Civilization in Modern Times | I 613 |
| Chance Images | I 340 | Cycles | I 621 |
| China in Western Thought and Culture | I 353 | Cynicism | I 627 |
| Christianity in History | I 373 | Death and Immortality | I 634 |
| Church as an Institution | I 412 | Deism | I 646 |
| Modernism in the Christian Church | I 418 | Democracy | I 652 |
| The City | I 427 | Demonology | I 667 |
| Civil Disobedience | I 434 | Design Argument | I 670 |
| Class | I 441 | Despotism | II 1 |
| Classicism in Literature | I 449 | Determinism in History | II 18 |
| Classification of the Arts | I 456 | Determinism in Theology: Predestination | II 25 |
| Classification of the Sciences | I 462 | Double Truth | II 31 |
| Sense of the Comic | I 467 | Dualism in Philosophy and Religion | II 38 |
| Conservation of Natural Resources | I 470 | Economic History | II 44 |
| Conservatism | I 477 | Economic Theory of Natural Liberty | II 61 |
| Constitutionalism | I 485 | Education | II 71 |
| Continuity and Discontinuity in Nature and Knowledge | I 492 | Empathy | II 85 |
| Cosmic Fall | I 504 | Enlightenment | II 89 |
| Cosmic Images | I 513 | The Counter-Enlightenment | II 100 |
| Cosmic Voyages | I 524 | EntropyII | 112 |
| Cosmology from Antiquity to 1850 | I 535 | Environment | II 120 |
| Cosmology since 1850 | I 554 | Environment and Culture | II 127 |
| Creation in Religion | I 571 | Epicureanism and Free Will | II 134 |
| Equality | II 138 | | |
| Equity in Law and Ethics | II 148 | Harmony or Rapture in Music | II 388 |
| Eschatology | II 154 | Health and Disease | II 395 |
| Problem of Evil | II 161 | Hegelian Political and Religious Ideas | II 407 |
| Evolution of Literature | II 169 | Heresy in the Middle Ages | II 416 |
| Evolutionism | II 174 | Heresy, Renaissance and Later | II 424 |
| Existentialism | II 189 | Hermeticism | II 431 |
| Experimental Science and Mechanics in the Middle Ages | II 196 | Hierarchy and Order | II 434 |
| Expressionism in Literature | II 206 | Historical and Dialectical Materialism | II 450 |
| Faith, Hope, and Charity | II 209 | Historicism | II 456 |
| Form in the History of Aesthetics | II 216 | Historiography | II 464 |
| Fortune, Fate, and Chance | II 225 | The Influence of Ideas on Ancient Greek Historiography | II 499 |
| Free Will and Determinism | II 236 | Holy (The Sacred) | II 511 |
| Free Will in Theology | II 242 | Humanism in Italy | II 515 |
| Legal Concept of Freedom | II 248 | Iconography | II 524 |
| Freedom of Speech in Antiquity | II 252 | Idea | II 542 |
| Game Theory | II 263 | Ideal in Philosophy from the Renaissance to 1780 | II 549 |
| General Will | II 275 | Ideology | II 552 |
| Genetic Continuity | II 281 | Ideology of Soviet Communism | II 559 |
| Genius from the Renaissance to 1770 | II 293 | Impiety in the Classical World | II 564 |
| Genius: Individualism in Art and Artists | II 297 | Impressionism in ArtII | 567 |
| Musical Genius | II 312 | Imprinting and Learning Early in Life | II 583 |
| Gnosticism | II 326 | Indeterminacy in Physics | II 586 |
| Idea of God from Prehistory to the Middle Ages | II 331 | Types of Individualism | II 594 |
| Idea of God, 1400-1800 | II 346 | Infinity | II 604 |
| Idea of God since 1800 | II 354 | Inheritance of Acquired Characteristics(Lamarckian) | II 617 |
| Concept of Gothic | II 366 | Inheritance through Pangenesis | II 622 |
| Happiness and Pleasure | II 374 | | |
| Irony | II 626 | Marxist Revisionism- From Bernstein to Modern Forms | III 161 |
| Irrationalism in the History of Philosophy | II 634 | Relativity of Standards of Mathematical Rigor | III 170 |
| Islamic Conception of Intellectual Life | II 638 | Mathematics in Cultural History | III 177 |
| Justice | II 652 | Changing Concepts of Matter from Antiquity to Newton | III 185 |
| Study of Language | II 659 | Metaphor in Philosophy | III 196 |
| Ancient Greek Ideas of Law | II 673 | Metaphor in Religious Discourse | III 201 |
| Ancient Roman Ideas of Law | II 685 | Metaphysical Imagination | III 208 |
| Common Law | II 691 | Millenarianism | III 223 |
| Concept of Law | III 1 | Mimesis | III 225 |
| Due Process in Law | III 6 | Moral Sense | III 230 |
| Equal Protection in Law | III 10 | Motif | III 235 |
| Natural Law and Natural Rights | III 13 | Motif in Literature: The Faust Theme | III 244 |
| Legal Precedent | III 27 | Literary Attitudes Toward Mountains | III 253 |
| Legal Responsibility | III 33 | Music and Science | III 260 |
| Liberalism | III 36 | Music as a Demonic Art | III 264 |
| Linguistics | III 61 | Music as a Divine Art | III 267 |
| Linguistic Theories in British Seventeenth-Century Philosophy | III 73 | Myth in Antiquity | III 272 |
| Literary Paradox | III 76 | Myth in Biblical Times | III 275 |
| Literature and Its Cognates | III 81 | Myth in the Middle Ages and the Renaissance | III 286 |
| Longevity | III 89 | Myth in English Literature: Seventeenth and Eighteenth Centuries | II 294 |
| Love | III 94 | Myth in the Eighteenth and Early Nineteenth Centuries | III 300 |
| Loyalty | III 108 | Myth in the Nineteenth and Twentieth Centuries | III 307 |
| Machiavellism | III 116 | Medieval and Renaissance Ideas of Nation | III 318 |
| Macrocosm and Microcosm | III 126 | Nationalism | III 324 |
| Man-Machine from the Greeks to the Computer | III 131 | | |
| Marxism | III 146 | | |
| Naturalism in Art | III 339 | Positivism in the Twentieth Century (Logical Empiricism) | III 545 |
| Nature | III346 | Pragmatism | III 551 |
| Necessity | III 351 | Pre-Platonic Conceptions of Human Nature | III 570 |
| Neo-Classicism in Art | III 362 | Primitivism | III 577 |
| Neo-Platonism | III 371 | Primitivism in the Eighteenth Century | III 598 |
| Newton and the Method of Analysis | III 378 | Probability: Objective Theory | III 605 |
| Newtons Opticks and Eighteenth-Century Imagination | III 391 | Progress in Classical Antiquity | III 623 |
| Number | III 399 | Progress in the Modern Era | III 633 |
| Optics and Vision | III 407 | Property | III 650 |
| Organicism | III 421 | Prophecy in Hebrew Scripture | III 657 |
| Oriental Ideas in American Thought | III 427 | Prophecy in the Middle Ages | III 664 |
| Ethics of Peace | III 440 | Protest Movements | III 670 |
| International Peace | III 448 | Psychological Ideas in Antiquity | IV 1 |
| Perennial Philosophy | III 457 | Psychological Schools in European Thought | IV 10 |
| Perfectibility of Man | III 463 | Psychological Theories in American Thought | IV 16 |
| Periodization in History | III 476 | Pythagorean Doctrines to 300 B.C. | IV 30 |
| Periodization in Literary History | III 481 | Pythagorean Harmony of the Universe | IV 38 |
| Philanthropy | III 486 | Ramism | IV 42 |
| Pietism | III 493 | Rationality among the Greeks and Romans | IV 46 |
| Rhetoric and Literary Theory in Platonism | III 495 | Realism in Literature | IV 51 |
| Platonism in Philosophy and Poetry | III 502 | Recapitulation | IV 56 |
| Platonism in the Renaissance | III 508 | Reformation | IV 60 |
| Platonism since the Enlightenment | III 515 | Relativism in Ethics | IV 70 |
| Poetry and Poetics from Antiquity to the Mid-Eighteenth Century | III 525 | Relativity | IV 74 |
| Positivism in Europe to 1900 | III 532 | Origins of Religion | IV 92 |
| Positivism in Latin America | III 539 | Ritual in Religion | IV 99 |
| Religion and Science in the Nineteenth Century | IV 106 | Ethics of Stoicism | IV 319 |
| Religious Enlightenment in American Thought | IV 109 | Structuralism | IV 322 |
| Religious Toleration | IV 112 | Style in Literature | IV 330 |
| Idea of Renaissance | IV 121 | Sublime in External Nature | IV 333 |
| Renaissance Humanism | IV 129 | Symbol and Symbolism in Literature | IV 337 |
| Renaissance Idea of the Dignity of Man | IV 136 | Symmetry and Asymmetry | IV 345 |
| Renaissance Literature and Historiography | IV 147 | Taste in the History of Aesthetics from the Renaissance to 1770 | IV 353 |
| Revolution | IV 152 | Technology | IV 357 |
| Rhetoric alter Plato | IV 167 | Temperance (Sōphrosynē) and the Canon of the Cardinal Virtues | IV 365 |
| Right and Good | IV 173 | Theodicy | IV 378 |
| Romanticism in Literature | IV 187 | Theriophily | IV 384 |
| Romanticism (ca. 1780-ca. 1830) | IV 198 | Time | IV 389 |
| Romanticism in Political Thought | IV 205 | Time and Measurement | IV 398 |
| Romanticism in Post-Kantian Philosophy | IV 208 | Totalitarianism | IV 400 |
| Satire | IV 211 | Sense of the Tragic | IV 411 |
| Victorian Sensibility and Sentiment | IV 217 | Uniformitarianism and Catastrophism | IV 417 |
| Sin and Salvation | IV 224 | Uniformitarianism in Linguistics | IV 423 |
| Skepticism in Antiquity | IV 234 | Unity of Science from Plato to Kant | IV 431 |
| Skepticism in Modern Thought | IV 240 | Universal Man | IV 437 |
| Social Contract | IV 251 | Utilitarianism | IV 444 |
| Social Democracy in Germany and Revisionism | IV 263 | Utility and Value in Economic Thought | IV 450 |
| Formal Theories of Social Welfare | V 276 | Utopia | IV 458 |
| Socialism from Antiquity to Marx | IV 284 | Ut pictura poesis | IV 465 |
| Space | IV 295 | Virtù in and since the Renaissance | IV 476 |
| Spontaneous Generation | IV 307 | Virtuoso | IV 486 |
| The State | IV 312 | Volksgeist | IV 490 |