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Part I. The Form of the Existing Universe: Letter 1. General considerations on the system of the universe
Letter 2. The power and reach of telescopes
Letter 3. Aspects, forms and distances of remote firmaments
Part II. The Constituent Mechanisms, or the Principle of the Vitality of Stellar Arrangements: Letter 4. Probable universality of planetary systems
Letter 5. Triple stars
Part III. The Origin and Probable Destiny of the Present Form of the Material Creation
Letter 6. The nebulae
Letter 7. The nebular hypothesis
Letter 8. Speculation
Notes
Additions and corrections.