Tetrachorda autem sunt quinque: primum gravissimum, quod graece dicitur hypaton, secundum medianum, quod appellatur meson, tertium coniunctum, quod synhemmenon dicitur, quartum disiunctum, quod diezeugmenon nominatur, quintum, quod est acutissimum, graece hyperbolaeon dicitur.
Now the tetrachords are five: the first is the lowest which in Greek is called hypaton; the second is the middle which is called meson; the third which is joined to these is called synh'mmenon; the fourth being separated is called diezeugmenon; the fifth which is the highest is called in Greek hyperbolaeon.
final_alignments\Vitruvius_Architecture_Book_5.json