In the year 1842, the Royal Society of Sciences of Göttingen proposed as a prize question the full discussion of the theory of the motions of Uranus. It was specially sought to learn the cause of the large and increasing error of Bouvard’s Tables that had been relied upon to show its motion and its precise position at any time. Several able mathematicians undertook this intricate problem. Among them were John C. Adams, of Cambridge University, England, Sears C. Walker, of Washington, a man whose sad fate it was to pass away ere his magnificent abilities could receive extended recognition, and M. Le Verrier, of Paris. Working unknown to each other, they reached similar conclusions almost at the same time. Though not the first to solve the problem, the brilliant Frenchman was the first to announce his result, which he did by writing a letter to Dr. Galle, of the Berlin Observatory, where there was one of the largest telescopes in Europe, and asking him to search for his computed planet, and assigning its supposed place in the heavens. The very night he received the letter Dr. Galle found the planet within one degree of the point designated. The next night it had moved one minute of space, and was also seen to have a perceptible disk. This settled the question, and stamped it as a planet. Le Verrier well merited the title bestowed upon him, “First astronomer of the age.” IV. METEORITES. The nineteenth century will be forever memorable for its witnessing the closing career and final destruction of a famous comet. First noticed in France, in 1772, and rediscovered, in 1826, by an Austrian officer named Biela, it bears his name. His computation showed that it traversed its orbit in six and one half years. When it reappeared in 1846, and again in 1852, it was seen to have split into two unequal fragments. It has not been seen since; but at every time when its return should have taken place the earth has passed through showers of meteors supposed to be its constituent particles, and to indicate its entire disintegration. During the meteoric shower of 1885, on the 27th of November, a large iron meteorite fell in Mazapil, Mexico, and chemical and physical investigation joined to pronounce it a part of the lost Biela’s comet.