A reading supported by only one recension he considered as having only one witness in its favour; those readings which were supported by all the three recensions, or even by two of them, especially if these two were the Alexandrian and the Western, he unhesitatingly accepted as genuine.
See his Symbolae criticae ad supplendas et corrigendas variarum N. T. lectionum collectiones (Halle, 1785, 1793), and his Commentarius criticus in textum Graecum N. T., which extends to the end of Mark and discusses the more important various readings with great care and thoroughness (Jena, 1794 if.).