¹ Norden thinks that the criticism may go back to M. Valerius Probus. But if that were so it is strange that no mention should be made in it of Vergil's debt to Ennius, with whose works Probus must have been well acquainted.

² The seventh book begins a new hexad, so that the six books which it introduced were read as a separate work complete in itself, and grammarians are always in the habit of quoting more largely from the first book of a series than from the subsequent books.