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Bodin (p. 455), “which chaunceth when ... you depart farthest from those concords which the Musitions call diatesseron and diapente.”
An octave or diapason was represented by the numerical ratio 1: 2, the fifth (diapente) by 2: 3, the fourth (diatesseron) by
Of these numerical relationships the easiest for the layman to grasp were the Pythagorean intervals of diatesseron (fourth), diapente (fifth), and diapason