Hughes
In any series of twelve, the primaries of the two first key-notes repeat the secondaries of the two last of a lower series of twelve; and the two last secondaries of the twelve in development are sounded as the two first primaries of a higher series of twelve. The three series are thus linked into each other. [Harmonies of Tones and Colours, Combinations of dissonance, rests, page 24]
Fourthly, we have one series of the seven of each of the twelve minor keys meeting by fifths through seven octaves. The keys of the twelve ascending scales are written in musical clef above the former, and the keys of the descending scales below. The ascending scales sound the fifth higher harmonies than the key-notes and their trinities, and the lower scales the fifth harmony lower than the key-notes and their trinities. The three series follow out their keys in three successive series, and all meet by fifths. [Harmonies of Tones and Colours, Diagram XV - The Twelve Major and the Twelve Minor Keys, page 42a]
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