In order to acquire an understanding of how the ekdosis of a text was constructed by the Alexandrian philologists, it is essential to keep in mind the common technical and material aspects of book production, designed to improve the new copy that was produced. The grammarians employed precisely these well-known methods that had the character of craft work, but utilized them in pursuit of a critical-philological aim, namely the creation not merely of a good copy, but rather of a good edition of the text itself. From this perspective, the present paper examines the example of a papyrus of Aeschines, P.Oxy. 2404. [ABSTRACT FROM AUTHOR]