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LIST OF PLATES.
Plate I. Frontispiece.
Fig. 1. Faculæ of the Sun.
Fig. 2. The Comet of 1819.
Fig. 3. The Nebula in Andromeda. Plate III. Fig. 1. Mars as seen August 16th, 1830.
Fig. 2. Jupiter as seen September 23rd, 1832.
Fig. 3. Saturn, showing the interior rings and belts. PLATE IV. Fig. 1. The great Nebula in Orion.
Fig. 2. The great Nebula in Argo. PLATE V. Fig. 1. Nebula (30 Doradûs) in the Nubecula Major. Fig. 2. Lunar Volcano, as shown by a 20 feet reflecting Te
lescope, aperture 18 inches. PLATE VI. Fig. 1. Various Appearances of Halley's Comet at its last
great Reflector. PLATE A. Figures illustrative of the Perturbations of Uranus by Nep
distance, and real diameter. First approximation to its orbit. An
ellipse about the Earth in the focus. Its excentricity and inclination.
Motion of its nodes and apsides. Of occultations and solar eclipses
generally. Limits within which they are possible. They prove the
Moon to be an opaque solid. Its light derived from the Sun. Its
phases. Synodic revolution or lunar month. Harvest Moon. Of
Masses of the primaries concluded from the periods of their satellites.
Maintenance of Kepler's laws in the secondary systems. Of Jupiter's
satellites. Their eclipses, etc. Velocity of light discovered by their
means. Satellites of Saturn-of Uranus- of Neptune - 354
Great number of recorded comets. The number of those uprecorded
probably much greater. General description of a comet. Comets with-
out tails, or with more than one. Their extreme tenuity. Their
probable structure. Motions conformable to the law of gravity.
Actual dimensions of comets. Periodical return of several. Halley's
comet. Other ancient comets probably periodic. Encke's comet-