Note 22 — § 22. The Scales as treated by Aristoxenus.
Reading edition
The fullest account of this curious fragment of notation is that given by Bellermann in his admirable book, Die Tonleitern und Musiknoten der Griechen, pp. 61-65. His conjectures as to its origin do not claim a high degree of probability. See the remarks on pp. 97-99.