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- The Task of Sidereal Astronomy
- The Methods of Sidereal Research
- The Stars as Suns
- The Chemistry of Red Stars
- Gaseous Stars and Nebulæ
- The Temperatures of the Stars
- Temporary Stars
- Stars Variable in Long Periods and Irregularly
- Variable Stars of Short Period
- The Colours of the Stars
- Double Stars
- Stellar Orbits
- Variable Double Stars
- Spectroscopic Binaries
- Multiple Stars
- The Evolution of Multiple Stars
- The Pleiades
- Star Clusters
- The Forms of Nebulæ
- The Great Nebulæ
- The Nature and Changes of Nebulæ
- The Distances of the Stars
- Translation of the Solar System
- The Proper Motions of the Stars
- The Milky Way
- Status of the Nebulæ
- The Construction of the Heavens
This work was published before January 1, 1927, and is in the public domain worldwide because the author died at least 100 years ago.
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