Note 35 — § 31. Scales of the Lyre and Cithara.
Reading edition
Ptol. Harm. ii. 16 periechetai de ta men en tê lyra kaloumena sterea tonou tinos hypo tôn tou toniaiou diatonou arithmôn tou autou tonou, ta de malaka hypo tôn en tô migmati tou malakou chrômatos apithmôn tou autou tonou. Here tonou tinos evidently means 'of any given key,' and tou autou tonou 'of that key.' There is either no restriction, or none that Ptolemy thought worth mentioning, in the choice of the key and species.