- 1Preface
- 2I — The Unsolved Problems of Astronomy
- 3II — The New Problems of the Universe
- 4III — The Structure of the Universe
- 5IV — The Extent of the Universe
- 6V — Making and Using a Telescope
- 7VI — What the Astronomers Are Doing
- 8VII — Life in the Universe
- 9VIII — How the Planets Are Weighed
- 10IX — The Mariner’s Compass
- 11X — The Fairyland of Geometry
- 12XI — The Organization of Scientific Research
- 13XII — Can We Make It Rain?
- 14XIII — The Astronomical Ephemeris and the Nautical Almanac
- 15XIV — The World’s Debt to Astronomy
- 16XV — An Astronomical Friendship
- 17XVI — The Evolution of the Scientific Investigator
- 18XVII — The Evolution of Astronomical Knowledge
- 19XVIII — Aspects of American Astronomy
- 20XIX — The Universe as an Organism
- 21XX — The Relation of Scientific Method to Social Progress
- 22XXI — The Outlook for the Flying-Machine
Side-Lights on Astronomy
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