- First Period—Pre-Socratic Philosophy
- I. Earlier Ionian School: Thales, Anaximander, Anaximenes
- II. The Pythagorean School
- III. The Eleatic School: Xenophanes, Parmenides, Zeno, Melissus
- IV. Later Ionian Philosophers: Heraclitus, Empedocles, Anaxagoras
- V. The Atomists: Leucippus, Democritus
- VI. The Sophists: Protagoras, Gorgias, Hippias, Prodicus
- Second Period—Socrates and the Socratic Schools
- Third Period—Post-Aristotelian Philosophy
- Character of Greek Philosophy
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- First Period of Scholasticism: Erigena to Roscelin
- Second Period of Scholasticism: Roscelin to Alexander of Hales
- XXVIII. Predecessors of Roscelin
- XXIX. Roscelin
- XXX. St. Anselm
- XXXI. William of Champeaux, The Indifferentists: Otto of Tournai, Adelard of Bath, Walter of Mortagne
- XXXII. Abelard
- XXXIII. The School of Chartres: Bernard and Theodoric of Chartres, William of Conches, Gilbert de la Porrée
- XXXIV. Eclectics: John of Salisbury, Peter the Lombard, Alanus of Lille, Gerard of Cremona
- XXXV. The Mystic School: St. Bernard; Hugh, Richard, and Walter, of St. Victor
- XXXVI. The Pantheistic School: Bernard of Tours, Amaury of Bène, David of Dinant
- Byzantine, Arabian, and Jewish Philosophy
- Third Period of Scholasticism: Alexander of Hales to Ockam
- XXXVII. Predecessors of St. Thomas: Simon of Tournai, Alexander Neckam, Alfred Sereshel, William of Auvergne, Alexander of Hales, John de la Rochelle, St. Bonaventure, Roger Bacon, Albert the Great
- XXXVIII. St. Thomas of Aquin
- XXXIX. Thomists and Anti-Thomists
- XL. Henry of Ghent
- XLI. John Duns Scotus
- XLII. Averroism in the Schools: Siger of Brabant, Boetius the Dacian, Bernier of Nivelles, Raymond Lully
- Fourth Period of Scholasticism: Birth of Ockam to taking of Constantinople
- Character of Scholastic Philosophy
- First Period—Transition from Scholastic to Modern Philosophy
- XLVIII. Scholastics of the Transition Period: Cajetan, Suarez, etc.
- XLIX. The Humanists: Pletho, Bessarion, Valla, etc.
- L. Italian Philosophy of Nature: Cardano, Telesio, Bruno, Campanella
- LI. The Scientific Movement: Copernicus, Kepler, Galileo, etc.
- LII. Protestant Mysticism: Luther, Zwingli, Böhme, etc.
- LIII. Systems of Political Philosophy: Machiavelli, More, Bodin, Hobbes
- Second Period—From Descartes to Kant
- Third Period—From Kant to our Own Time
- LXIII. German Philosophy: Kant
- LXIV. German Philosophy (continued): The Kantians, The Romantic Movement, Fichte, Schelling
- LXV. German Philosophy (continued): Hegel, The Hegelians
- LXVI. German Philosophy (continued): The Reaction against Hegel; Herbart, Schopenhauer
- LXVII. The Scottish School: Reid, Brown, Stewart, etc.
- LXVIII. French Philosophy: The Traditionalists, The Eclectics, The Positivists, The Sociologists
- LXIX. English Philosophy: The Association School, Utilitarianism, Evolution, Idealism
- LXX. Italian Philosophy: Vico, Galuppi, Rosmini, Gioberti, etc.
- LXXI. American Philosophy: Edwards, McCosh, Brownson, etc.
- LXXII. Catholic Philosophy in the Nineteenth Century: The Neo-Scholastic Movement
- LXXIII. Contemporary Philosophy in Germany, France, England, Italy, America
- LXXIV. Conclusion