It will be interesting to see in a German professor devoted to the severest, most abstract and super-mundane of studies, the appearance, course, and dying away of the "malady" of love. We almost believe that this case is so easy of analysis that the very _bacillus_ may be discovered. Before, however, we come to the story of Professor Maedler's love episode, we must say a word about his previous history. Maedler was born at Berlin on May 29th, 1794, in the very month of love, though at its extreme end. He began life as a schoolmaster, but soared in his leisure hours into a purer atmosphere than that of the schoolroom; he began to study the stars, and found them brighter and more interesting than the heads of his pupils. In 1828 William Beer, the Berlin banker, brother of the great composer, Meyerbeer, a Jew, built a small observatory in the suburbs of Berlin. He had made the acquaintance of Maedler, they had the same love of the stars, and they became close friends. The Beers were a gifted family, running out in different directions. Michael, a third brother, was a poet, and wrote tragedies, one or two of which occasionally reappear on the boards. The result of the nightly star gazings was an article on Mars when in opposition, with a drawing of the surface as it appeared to Beer and Maedler, through the telescope of the former. But Mars did not admit of much further scrutiny, it presented no more problems they were capable of solving, so they devoted themselves to the moon. A gourmand exists from dinner to dinner, that meal is the climax of his vitality, that past he lapses into inertness, indifference, quiescence. Full moon was the exciting moment of the periods in Maedler's life, which was divided, not like a gourmand's day, into periods of twenty-four hours, but into lunar months. When the moon began to show, Maedler began to live; his interest, the pulses of his life quickened as full moon approached, then declined and went to sleep when there was no lunar disc in the sky. From 1834 to 1836 he issued his great map of the moon, and so made his name. But beyond that, in the summer of 1833 he was employed by the Russian Government on a chronometrical expedition in the Baltic. When his map came out, he was at once secured by the Prussian Government as assistant astronomer to the observatory at Berlin, recently erected. In 1840 he became a professor, and was summoned to take charge of the observatory, and lecture on astronomy, in the Russian University of Dorpat. There he spent six uneventful years. He was unmarried, indifferent to female society, and as cold as his beloved moon. He was as solitary, as far removed from the ideas of love and matrimony, as the Man in the Moon.