Johann Gottfried Jakob Hermann, a German philologist, born in Leipsic, Nov. 28,1772, died Dec. 31, 1848. After studying law and philology at Leipsic and Jena, he began to lecture on ancient literature at Leipsic in 1794, and in 1798 was appointed extraordinary professor of philosophy. In 1803 he accepted the professorship of eloquence, and retained it until his death, together with that of poetry, which was united with it in 1809. He interested himself also in the Greek society which was founded in 1799, and in 1834 assumed the direction of the school of philology. His services to the cause of classical learning were very important. His researches were original, and their results were presented in his lectures with great vigor and clearness. He was particularly noted for the new principles which he developed in reference to the classical metres and the Greek grammar. His principal works in regard to the metres were : De Me-tris Groecorum et Romanorum Poetarum (Leipsic, 1796); Handbuch der Metrik (1798); Ele-menta Doctrinoe Metricoe (1816); Epitome Doc-trinoe Metricoe (1818; 2d ed., 1844); and De Metris Pindari, in Heyne's edition of Pindar (3 vols., 1817). The principles. which he applied in the grammar of the Greek language may be found in his treatise De Emendanda Ratione Groecoe Grammaticoe (1801), and in his annotations of Vigier's De Groecoe Dictionis Idiotismis (1802; 4th ed., 1834) and Libri IV de Particula av (1831). He also edited most of the plays of Euripides, the "Clouds" of Aristophanes, the "Trinummus" of Plau-tus, the "Poetics" of Aristotle, the hymns of Orpheus, and those ascribed to Homer, Bion, Moschus, and AEschylus, and completed the edition of Sophocles begun by Erfurdt. He discussed the significance of classical mythology in De Mythologia Groecorum Antiquissima (1807), and in Briefe uber Homer und Hesio-dus, written by him and Creuzer (Heidelberg, 1818). A collection of his essays was published under the title Opuscula (7 vols., 1827-'30).