LXX.
The Measure of Sounds, as high or low, is the Musical Scale, or Harmonic Canon. (iv. 4.)
LXXI.
The Measures of Pure Colours are the Prismatic Scale; the same, including Fraunhofer’s Lines; and Newton’s Scale of Colours. The principal Scales of Impure Colours are Werner’s Nomenclature of Colours, and Merimée’s Nomenclature of Colours. (iv. 4.)
LXXII.
The Idea of Polarity involves the conception of contrary properties in contrary directions:—the properties being, for example, attraction and repulsion, darkness and light, synthesis and analysis; and the contrary directions being those which are directly opposite, or, in some cases, those which are at right angles. (v. 1.)
LXXIII. (Doubtful.)
Coexistent polarities are fundamentally identical. (v. 2.)
LXXIV.
The Idea of Chemical Affinity, as implied in Elementary Composition, involves peculiar conceptions. It is not properly expressed by assuming the qualities of bodies to resemble those of the elements, or to depend on the figure of the elements, or on their attractions. (vi. 1.) 19