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430 _History of Physical Astronomy_, by Robert Grant, F.R.A.S.
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431 _Cosmos_, by Alexander von Humboldt (Sabine's Edition).
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432 _Handbook of Astronomy_, by Dionysinus Lardner, D.C.L.
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433 _The Planetary Worlds_, by James Breen. London, 1854, p.
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434 _Of the Plurality of Worlds. An Essay_. Fourth Edition.
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435 _Vestiges of the Natural History of Creation_. Eleventh
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436 _The Treasury of Science_, by Friedrich Schoedler, Ph.D.
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437 _Spectrum Analysis_, by Dr. H. Schellen. London, 1872, p.
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438 _The Moon_, by James Nasmyth, C.E., and James Carpenter,
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439 _Astronomy_, by J. Rambosson. Translated by C. B. Pitman.
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440 _The Three Heavens_, by the Rev. Josiah Crampton, M.A.
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441 _Scientific and Literary Treasury_, by Samuel Maunder.
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442 _The Mathematical and Philosophical Works of John
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443 _A Plurality of Worlds_, by Bernard le Bovier de Fontenelle.
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444 _More Worlds than One_, by Sir David Brewster, M.A.,
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445 _An Introduction to Astronomy_, by John Bonnycastle.
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446 _Elements of Astronomy_, by John Brinkley, D. D., F.R.S.
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447 _Celestial Scenery_, by Thomas Dick, LL.D. London, 1838, p.
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448 _The Moon_, by Edmund Neison, F.R.A.S. London, 1876, pp.
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449 _The Art of Scientific Discovery_, by G. Gore, LL. D., F.R.S.
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450 _The Moon, her Motions, Aspect, Scenery, and Physical,
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451 _Other Worlds than Ours_. London, 1878, p. 167.

452 _An Historical Account of Astronomy_, by John Narrien,
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453 _Plutarch's Morals_. Translated by P. Holland. London, 1603,
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454 _Cosmotheoros_, by Christian Huyghens van Zuylichem.
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455 _The Wisdom of God in the Creation_, by John Ray, F.R.S.
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456 _On the Earths in our Solar System_, by Emanuel Swedenborg.
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