Sir Isaac Newton made one of the most wonderful discoveries in the world of science and nature, the law of gravitation, and also invented a method by which the whole course of a comet could be calculated. On his monument you will see a globe, covered with constellations and the path of a comet, while below are groups of children weighing the sun and the moon. The long Latin epitaph was one which greatly offended Dr. Johnson, who said that "none but philosophers could understand it." Sir John Herschel was the son of a distinguished father, and from his boyhood he resolved to follow in his father’s footsteps. "To put my shoulders to the wheel, and to leave the world a little better than I found it," was the ideal he set before himself whilst at Cambridge, and in this spirit he carried on the work of making a careful study of the stars in the southern hemisphere, which had never been done before. Besides astronomy he was devoted to books, especially to poetry, and translated many of Schiller’s poems, as well as parts of the "Iliad," into English. "Give a man," he said, "once the taste for reading good books, and you place him in contact with the best society in every period of history, with the wisest, the wittiest, the tenderest, the bravest, and the purest of characters who have adorned humanity. You make him a denizen of all nations, a contemporary of all ages." His eyes were fixed on the stars; his heart was ever set on those things that are above. These are the beautiful words in which he has described the object and the end of all his study:— "To spring even a little way aloft, to carol for awhile in bright and sunny regions—to open the doors of the human mind to let in light and knowledge, always sure that right will come right at last—to rise to the level of our strength, and if we must sink again, to sink not exhausted but exercised, not dulled in spirit, but cheered in heart—such may be the contented and happy lot of him who can repose with equal confidence on the bosom of the earth, or ride above the mists of earth into the empyrean day." He died loaded with honours in 1871, though no man sought fame or honour less. "Enough if cleansed at last from earthly stain, My homeward step be firm, and pure my evening sky." Thus had he written, and how could longing soar higher? [Illustration: CHARLES DARWIN.]