Abstract
On this the following observations should be made: 1. The sigla ABCEFM are used here as in all editions from Hude onwards, H as in Hude though not universally since, and as in Bartoletti, Per la storia del testo di Tucidide ; have not been used before. 2. In positing β as ancestor of ABEFHM but not of C I follow Hude, Bartoletti, Stuart Jones, and Powell. I differ from them in leaving out of consideration G , which is normally considered as descending from a congener of C; since, however, one or more ancestors of G were collated with at least one manuscript related to M and probably with manuscripts of other affinities also, there are clearly no means of deciding whether G is a descendant of C or ultimately independent of C, and I have adopted the economical hypothesis that it is a descendant and must be relegated to the recentiores