"For the actual examination of the manuscripts, the establishment of the text, and the translation, the senior editor is responsible. The rest of the work has been executed in strict collaboration, but in the commentary the senior editor is, as a rule, primarily responsible for the philological, and the junior editor for the historical, matter. In the Prolegomena, the senior editor is primarily responsible for the greater part of the matter on Mussato, and the junior editor for that on Dante."--p. viii.