“ A telescopic examination of this planet is really a difficult affair. One of the planets that were known in ancient times is so difficult to observe as Mercury, and none presents so many obstacles to the study of its orbit and physical constitution. As to its orbit, Mercury is the only planet the course of which seems even now to have partly cut loose from the laws of universal gravitation, and the theory of which, although well built up by the genius of Leverrier, is still in considerable disagreement with the observations. ”

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