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occurs naturally from MI to FA, and SI to DO, but accidentally from LA to SI flat.
The Tone occurs naturally between all notes except between SI and DO, and between MI and FA, but accidentally between SI flat and DO. The Tone is sometimes called a Major Second, and the semitone a Minor Second.
The Semiditone, or Minor Third, contains a tone and a semi-tone.
The Ditone, or double tone, or Major Third, contains two tones.
The Diatesseroni or Just Fourth", contains two tones and one semi-tone.
The Tritone, or triple tone, or Major Fourth, contains three tones, and occurs naturally only between FA and SI. This interval used to be known as the "diabolus" on account of its occasional unpleasantness. Consequently the SI is sometimes flattened. Whenever this is to be done, the accidental signis, in the Dominican chant books, always placed before SI;