Probably the lowest harmony which we have the power of partially hearing is A minor, rising in the lower series of seven octaves; C, its highest note, sounding the six tones of C, its major harmony, on our horizon of sound. The diagram begins with A, the second space of the treble clef, as most convenient for writing.

Below the circular diagram are seen in musical clef the twelve minor key-notes, as gained from the majors. There is only one meeting of the same note in the seven of every major harmony. All the twelve follow the same plan; the lowest note of the seven of C is F, the highest note of the seven is E. The lowest tone sounded by E and the highest tone sounded by F is the same, A—leading the ear from C to its relative minor A.

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Hughes
The minor harmonies
—The eighteen tones repeated veering round, and in musical clef below, showing the twelve that develope minor harmonies
—The twelve minor key-notes as gained from the twelve major, . . . . . . . . . . 32 [Harmonies of Tones and Colours, Table of Contents3 - Harmonies]