Balance of color, 23, 47, 67, 75-77, 81-86, 106, 108, 111, 114, 132, 136, 142, 147, Appendix III. Black, 12, 16, 22, 31, 41, 54, 55, 65, 91, 119. 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. Atlas, 129. Balance, 23, 47, 67, 75-77, 81-86 (triple), 106, 108, 111, 114, 132, 136, 142, 147. Blindness, 182, 183. Charts, 14, 17, 126, 127, 135, 136, 140. Circuit, 54, 58, 59. Complementary, 76, 77. Color, dimensions of, 3, 8, 9, 13, 25, 53, 94, 116. Curves, 94. Discs, Maxwell’s, 76, 93, 106-112, 113, 117. Harmony, 47, 77, 86, 145-148, 151-174, 180. Hand as a holder of, 54-58. Key of, 6, 151, 152. Language, poverty of, 5, 175. Lists, 131. Measured, 3, 14, 32. Meridians, 136, 137. Middle, 28, 29, 40-42, 113. Misnomers, Appendix I. Mixture, 56-72. Names, 1, 2, 14, 19, 25, 90, 91, 131. Notation, 36, 37, 40-42, 47, 67, 72, 86, 101, 133. Orange, 9-11, 89, 123. Parallels, 12, 119. Paths, 157, 158, 160-164. Perception, 27, 29, 39, 179. Principal (5), 4, 16, 21, 26, 31, 34, 40, 54, 56, 57. Principal (5) and intermediates (5), 31, 60, 68, 112, 134. Purity, 8, 19, 23, 89, 98, 99. Records 145. Relations, 14, 24, 36, 37, 153. Rhythm, 166. Scale, 3, 7, 24, 30, 55, 120, 140, Appendix II. Score, 133-139, 142, 173. Sensations, 3, 4, 15, 19, 21, 87. Sequences, 47, 78, 79, 120, 156, 169-171, 181. Sir Isaac Newton’s, 89. Schemes, Appendix V. Solid, 14, 19, 102, 126, 129, 140, 153. Spectral, 16, 88, 94, 129. Sphere, 12-17, 24, 25, 31, 43, 55, 72, 91, 101, 102, 111, 122, 132. Standard, 4, 26, 35. System, 3, 8, 28, 123, 130. Need of, 46, 148. Tree, 14, 30-34, 43, 94, 95, 124. Waves, 21, 23, 136. Tones, 134. Children’s color studies, Appendix IV. Colorist, 84, 121, 177. Coloristic art, 7, 38, 45, 177. Combined scales, 12, 14, 36, 37, 47. Complements, 76, 77. Course of color study, 48-50. Daylight photometer, 22, 103, 119. Enamels, 28, 29, 101, 117. Fading, 8, 23. False color balance, Appendix III. Flat diagrams, 14. Fundamental sensations, 28, Appendix III. Green, 2, 32, 104, 136, 137, 140, 147, 148. Hue, 3, 4, 8, 9-11, 14, 18, 21-26, 34, 39, 40, 43, 54, 59, 76, 82, 89, 105. Scale of, 12, 19, 25, 31, 35, 120, 133. Ideal color system, 100. Lambert’s pyramid, note to 31. Luminist, 121.