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due to the same causes as that of Jupiter’s
fourth satellite, and proves that it always
turns the same face to the planet.
Uranus and Neptune .–The splendid dis-
coveries of Uranus and two satellites by Sir
William Herschel in 1787, and of Neptune
by Adams and Le Verrier in 1846, have been
already described. Lassel added two more
satellites to Uranus in 1851, and found Nep-
537