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LETTER I. Of Magnitude, or Extension.
LETTER II. Of Velocity.
LETTER III. Of Sound, and Its Velocity.
LETTER IV. Of Consonance and Dissonance.
LETTER V. Of Unison and Octaves.
LETTER VI. Of Other Consonances.
LETTER VII. Of the Twelve Tones of the Harpsichord.
LETTER VIII. Of the Pleasure Derived from Fine Music.
LETTER IX. Compression of the Air.
LETTER X. Rarefaction and Elasticity of the Air.
LETTER XI. Gravity of the Air.
LETTER XII. Of the Atmosphere, and the Barometer.
LETTER XIII. Of Air-guns, and the Compression of Air in Gunpowder.
LETTER XIV. The Effect Produced by Heat and Cold on All Bodies, and of the Pyrometer and Thermometer.
LETTER XV. Changes Produced in the Atmosphere by Heat and Cold.
LETTER XVI. The Cold Felt on High Mountains and at Great Depths Accounted for.
LETTER XVII. Of Light, and the Systems of Descartes and Newton.
LETTER XVIII. Difficulties Attending the System of Emanation.
LETTER XIX. A Different System Respecting the Nature of Rays and of Light, Proposed.
LETTER XX. Of the Propagation of Light.
LETTER XXI. Digression on the Distances of the Heavenly Bodies, and on the Nature of the Sun, and His Rays.
LETTER XXII. Elucidations on the Nature of Luminous Bodies, and Their Difference from Opaque Bodies Illumined.
LETTER XXIII. How Opaque Bodies Become Visible. Newton's System of the Reflection of Rays Proposed.
LETTER XXIV. Examination and Refutation of Newton's System.
LETTER XXV. A Different Explanation of the Manner in Which Opaque Bodies Illuminated Become Visible.
LETTER XXVI. Continuation of the Same Subject.
LETTER XXVII. Conclusion: Clearness and Colour of Opaque Bodies Illuminated.
LETTER XXVIII. Nature of Colours in Particular.
LETTER XXIX. Transparency of Bodies Relative to the Transmission of Rays.
LETTER XXX. Of the Transmission of Rays of Light, through Transparent Mediums, and Their Refraction.
LETTER XXXI. Refraction of Rays of Different Colours.
LETTER XXXII. Of the Azure Colour of the Heavens.
LETTER XXXIII. Of Rays Issuing from a Distant Luminous Point, and of the Visual Angle.
LETTER XXXIV. Of the Assistance Which Judgment Lends to Vision.
LETTER XXXV. Explanation of Certain Phenomena Relative to Optics.
LETTER XXXVI. Of Shadow.
LETTER XXXVII. Of Catoptrics, and the Reflection of Rays from Plain Mirrors.
LETTER XXXVIII. Reflection of Rays from Convex and Concave Mirrors. Burning Mirrors.
LETTER XXXIX. Of Dioptrics.
LETTER XL. Continuation. ,--- ,Of Burning-glasses and Their Focus.
LETTER XLI. Of Vision, and the Structure of the Eye.
LETTER XLII. Continuation. Wonders Discoverable in the Structure of the Eye.
LETTER XLIII. Further Continuation. --- Astonishing Difference between the Eye of an Animal, and the Artificial Eye or Camera Obscura.
LETTER XLIV. Perfections Discoverable in the Structure of the Eye.
LETTER XLV. Of Gravity, Considered as a General Property of Body.
LETTER XLVI. Continuation. Of Specific Gravity.
LETTER XLVII. Terms Relative to Gravity, and Their True Import.
LETTER XLVIII. Reply to Certain Objections to the Earth's Spherical Figure, Derived from Gravity.
LETTER XLIX. True Direction and Action of Gravity Relatively to the Earth.
LETTER L. Different Action of Gravity with Respect to Certain Countries and Distances from the Centre of the Earth.
LETTER LI. Gravity of the Moon.
LETTER LII. Discovery of Universal Gravitation by Newton.
LETTER LIII. Continuation. Of the Mutual Attraction of the Heavenly Bodies.
LETTER LIV. Different Sentiments of Philosophers Respecting Universal Gravitation. The Attractionists.
LETTER LV. Power by Which the Heavenly Bodies are Mutually Attracted.
LETTER LIV. The Same Subject Continued.
LETTER LVII. The Same Subject Continued.
LETTER LVIII. Motion of the Heavenly Bodies. Method of Determining It by the Laws of Universal Gravitation.
LETTER LIX. System of the Universe.
LETTER LX. The Same Subject Continued.
LETTER LXI. Small Irregularities in the Motions of the Planets, Caused by Their Mutual Attraction.
LETTER LXII. Description of the Flux and Reflux of the Sea.
LETTER LXIII. Different Opinions of Philosophers Respecting the Flux and Reflux of the Sea.
LETTER LXIV. Explanation of the Flux and Reflux, from the Attractive Power of the Moon.
LETTER LXV. The Same Subject Continued.
LETTER LXVI. The Same Subject Continued.
LETTER LXVII. The Same Subject Continued.
LETTER LXVIII. More Particular Account of the Dispute Respecting Universal Gravitation.
LETTER LXIX. Nature and Essence of Bodies; or Extension, Mobility, and Impenetrability of Body.
LETTER LXX. Impenetrability of Bodies.
LETTER LXXI. Of the Motion of Bodies, Real and Apparent.
LETTER LXXII. Of Uniform, Accelerated, and Retarded Motion.
LETTER LXXIII. Principal Law of Motion and Rest. Disputes of Philosophers on the Subject.
LETTER LXXIV. Of the Inertia of Bodies: Of Powers.
LETTER LXXV. Changes Which May Take Place in the State of Bodies.
LETTER LXXVI. System of the Monads of Wolff.
LETTER LXXVII. Origin and Nature of Powers.
LETTER LXXVIII. The Same Subject. Principle of the Least Possible Action.
LETTER LXXIX. On the Question, Are There Any Other Species of Powers?
LETTER LXXX. Of the Nature of Spirits.
LETTER LXXXI. Of the Union between the Soul and the Body.
LETTER LXXXII. Different Systems Relative to This Subject.
LETTER LXXXIII. Examination of the System of Pre-established Harmony. Objection to It.
LETTER LXXXIV. Another Objection.
LETTER LXXXV. Of the Liberty of Spirits; and a Reply to Objections against Liberty.
LETTER LXXXVI. The Same Subject Continued.
LETTER LXXXVII. Influence of the Liberty of Spirits upon Events.
LETTER LXXXVIII. Of Events, Natural, Supernatural, and Moral.
LETTER LXXXIX. Of the Question Respecting the Best World Possible; and of the Origin of Evil.
LETTER XC. Connexion of the Preceding Considerations with Religion. Reply to the Objections of the Philosophical Systems against Prayer.
LETTER XCI. The Liberty of Intelligent Beings in Harmony with the Doctrines of the Christian Religion.
LETTER XCII. Elucidation Respecting the Nature of Spirits.
LETTER XCIII. The Subject Continued. Reflections on the State of Souls after Death.
LETTER XCIV. Considerations on the Action of the Soul upon the Body, and of the Body upon the Soul.
LETTER XCV. Of the Faculties of the Soul, and of Judgment.
LETTER XCVI. Conviction of the Existence of What We Perceive by the Senses. Of the Idealists, Egotists, and Materialists.
LETTER XCVII. Refutation of the Idealists.
LETTER XCVIII. The Faculty of Perceiving. Reminiscence, Memory, and Attention. Simple and Compound Ideas.
LETTER XCIX. Division of Ideas into Clear and Obscure, Distinct and Confused. Of Distraction.
