Ideoque et a numero nomina ceperunt, quod, cum vox constiterit in una sonorum finitione ab eaque se flectens mutaverit et pervenerit in quartam terminationem, appellatur diatessaron, in quintam diapente [in sextam diapason in octavam et dimidiam diapason et diatessaron, in nonam et dimidiam diapason diapente, in xii disdiapason].
These have taken their names from numbers. For when the voice has rested in one fixed sound, and then modulates and changes from itself, and comes to the fourth sound it is called diatessaron; when it comes to the fifth, it is called diapente; [to the eighth, diapason; to the eleventh, diapason with diatessaron; to the twelfth, diapason with diapente to the fifteenth disdiapason],
final_alignments\Vitruvius_Architecture_Book_5.json