Petrusakten
He lectured on the history of dogma, church history, patristics, and after Knapp's death, on the New Testament. He is remembered for his planned series of editions of apocrypha, "Codex Apocryphus Novi Testamenti" of which the first volume appeared in 1832, which set a new standard in textual criticism in this field. His editions appeared of "Acts of Thomas" (1823), "Acts of Peter and Paul" (1838), "Acta Andreae et Matthiae apud Anthropophagos" (1846), "Acts of John" by "Leucius Charinus" (1847).