Blue, [9], [12], [16], [34], [104], [146], [147].

Brewster’s theory, [Appendix III].

Charts of the color sphere, [14], [17], [126], [127], [135], [136], [140].

Chevreul, [Appendix III.], [V].

Chroma, [3], [4], [8], [11], [14], [21]–[24], [28], [39], [40], [42], [45], [64], [76], [78], [82], [88], [94], [95], [105], [121], [132].

Scale of, [12], [19], [25], [31]–[35], [42], [133].

Strongest, [32], [34], [42].

Chromatic tuning fork, [117], [118], [119]–[127].

Circuit, inclined, [16], [17], [97].

Color, apparatus, [3], [8], [14], [132].