Besides early work on Aristophanes, Pindar, and Sappho, whose character he vindicated, he edited Alcman (1815), Hipponax (1817), Theognis (1826) and the "Theogony" of Hesiod (1865), and published a "Sylloge epigrammatum Graecorum" (Bonn, 1828). His "Griechische Götterlehre" (3 vols., Göttingen, 1857–1862) may be regarded as the first scientific treatise on Greek religion. Among his works on Greek literature the chief are "Die Äschyleische Trilogie" (1824, 6), "Der epische Zyklus oder die Homerischen Geschichte" (2 vols. 1835, 49), "Die griechischen Tragödien mit Rücksicht auf den epischen Zyklus geordnet" (3 vols., 1839–1841). His editions and biography of Zoega, his "Zeitschrift für Geschichte und Auslegung der alten Kunst" (Göttingen, 1817, 8) and his "Alte Denkmäler" (5 vols., 1849–1864) contain his views on ancient art.