German author and critic, born at Darmstadt on the 11th of April 1741, a few days after the death of his father, a chemist. He studied law at Giessen, and in 1767 was given and appointment in the paymasters department at Darmstadt, and a year later himself became paymaster. For a number of years he exercised considerable influence upon the literary movement in Germany; he helped to found the Frankfurter gelehrte Anzeigen in 1772, and was one of the chief contributors to Nicolais Allgemeine Bibliothek. In 1782 he accompanied the Landgravine Karoline of Hesse-Darmstadt to St. Petersburg, and on his return was a guest of the Duke Charles Augustus of Weimar in the Wartburg. Unfortunate speculations brought him into pecuniary embarrassment in 1788, and although friends, notably Goethe, were ready to come to his assistance, his lossescombined with the death of five of his childrenso preyed upon his mind that he committed suicide on the 27th of June 1791. Merck distinguished himself mainly as a critic; his keen perception, critical perspicacity and refined taste made him a valuable guide to the young writers of the Sturm und Drang. He also wrote a number of small treatises, dealing mostly with literature and art, especially painting, and a few poems, stories, narratives and the like; but they have not much intrinsic importance. Mercks letters are particularly interesting and instructive, and throw much light upon the literary conditions of his time.
Mercks Ausgewählte Schriften zur schönen Literatur und Kunst were published by A. Stahr in 1840, with a biography. See Briefe an J. H. Merck von Goethe, Herder, Wieland und andern bedeutenden Zeitgenossen (1835), Briefe an und von J. H. Merck (1838) and Briefe aus dem Freundeskreise von Goethe, Herder, Höpfner und Merck (1847), all edited by K. Wagner. Cf. G. Zimmermann, J. H. Merck, seine Umgebung und seine Zeit (1871).