Harmoniesystem in dualer Entwickelung:
Studien zur Theorie der Musik (1866)*
Brief summary:
Oettingen's bridge-building blueprints called for modifying Helmholtz's work with Hauptmannian supports
Oppositional structures inhered in "strict scientific principles" and were governed by logical relations that could no more be questioned than laws of gravity
Take Hauptmann's oppositional structure -- having/being -- to generate his theory, i.e. tonic/phonic
Major triad as "tonically consonant; phonically dissonant" and minor triad as "tonically dissonant; phonically consonant"
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Digest of Daniel Harrison's Harmonic Function in Chromatic Music: A Renewed Dualist Theory and an Account of Its Precedents.
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* An enlarged version was published in 1913 February under the title, Das duale Harmoniesystem.