Masks, 47, 167-171. Maxwell discs, 93, 107, 113, 117. Measurement of colors, 3, 8, 14, 116, Appendix IV. Middle gray, 61, 65, 72. Middle hues, 10, 28, 65. Mixture of hues, 56-72. Musical terms used for colors, 6, 46, 148-150. Neutral axis, 31, 34, 61, 65, 121. Neutral gray, 11, 23, 25, 62, 64, 65, 72, 114, 102. Notation diagram, 140. Orange, 9-11, 18, 123. Personal bias, 144, 174. Pigments, 14, 27-29, 101-104, 125, 129. Photometer, 65. Primary sensations, 89. Prismatic color sphere, 98. Purple, 5. Rainbow, 15, 17. Red, middle, 1, 32, 41, 60, 66, 72, 104, 110, 122, 147, 148. Retina, 21. Rood, modern chromatics, Appendix I. Runge, note to 31, Appendix V. Shades and tints, 22. Spectrum, solar, 15-18, 27, 28, 87, 88, 92, 95, 96. Tone, 6. Value, 3, 8-11, 14, 21-24, 28, 34, 39, 40-43, 54, 76, 78, 82, 94, 105, 120, 132. Scale of, 12, 19, 25, 31, 34, 35, 64, 102, 120, 133. Vermilion, 42, Appendix III. Vertical (neutral) axis, 12, 25, 31, 34, 65, 68. Violet, 90. Warm and cold colors, 72, 123, note to 136, 137, 138. Wave lengths, 21, 22, 23, 89. White, 12, 16, 17, 22, 31, 41, 54, 55, 65, 87, 91, 92, 99, 119. Yellow, 1, 32, 54, 104, 136. The MUNSELL PHOTOMETER Patented November 19, 1901 A portable, daylight instrument, adapted to laboratory work in general, and of especial service in the comparison of color values. Placed in the course of Optical Measurements at the Massachusetts Institute of Technology Price, $50 [Decoration] IN PREPARATION A COLOR ATLAS Also text-books and models specially designed to serve in the education of the color sense End of the Project Gutenberg EBook of A Color Notation, by Albert H. Munsell