Text: A name given to the chord of the ninth on the tonic, as opposed to that of the ninth of the dominant, owing to the fact that the former is more often used as a prepare discord than the latter. The ninth may or may not be accompanied by the seventh. The ninth and seventh are both used with the fourth, or, as it is more properly termed, the eleventh on the tonic; under "Suspension". The division of discords into discords of suspension, discords of retardation, discords by addition, and fundamental discords, is purely arbitrary, consequently hardly any two authors apply these names in the same way. It is hardly desirable that a simple and consistent method of arranging chords should be generally adopted. Minor Ninth 32:15 Major Ninth 9:4

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Source: 125