Camera boxes, 28. Camera, construction of, 28. Camera stands, 31. Carbonate of soda, 73. Chemical and visual focus, 21. China clay, 75. Chloride of ammonium, 77. Chloride of barium, 77. Chloride of gold, preparation of, 83; for toning, 155 Chloride of sodium, 78. Chlorine, 75. Chromatic aberration, 22. Citric acid, 78. Cleaning glass plates, 129. Coating large glasses with collodion, 160. Collodion, manufacture of, 53; iodized for positives, 58, 59; for negatives, 60; mode of coating glasses with, 131; vials, 38. Collodio-Albumen process, Dr. Taupenot, 190. Color-boxes, 38. Cutting's patents and correspondence, 173. Cyanide of potassium, 79; use of, 63. Decomposition of light, 16. Developing solution for positives, 62; for negatives, 144, 145. Dippers, glass and gutta-percha, 34. Double iodide of potassium and silver, 61. Ether, preparation of, 79. Fixing positives on glass, 134; negatives on glass, 146; positives on paper, 155. Fluoride of potassium, 81. Fogging of collodion positives, 137. Formic acid, 81. Fulminating gold, 84. Gelatine, properties of, 82; for mounting photographs, 157. Glass, cementing, 158. Glass plates, cleaning of, 129; coating with collodion, 131; coating with albumen, 193. Glass rods, bending of, 158. Glycerine, its properties, 82. Gold, chloride of, preparation of, 85; for toning, 155. Grape sugar, 86. Hadow, Mr., Researches and Formula for making soluble cotton, 46; on iodizing collodion, 54. Head rests, 33. Helio, collodion process for positives and negatives, 164. Honey, 86. Humphrey's collodion gilding, 63. Hydrochloric acid, 87. Hydriodic acid, 87. Hydrosulphuric acid, 88. Hypo bath, 203. Hyposulphite of gold, 85. Hyposulphite of silver, 17. Hyposulphite of soda, preparation and properties of, 89. Instantaneous positives, 159. Iodide of ammonium, preparation of, 91; for iodizing collodion, 58, 59. Iodide of cadmium, 92. Iodide of iron, preparation of, 93; its uses and acceleration, 159. Iodide of potassium and silver, preparation of, 61; use in sensitizing collodion, 58, 60. Iodide of potassium, properties and preparation of, 94. Iodide of silver, preparation and properties of, 112; its use in the nitrate bath, 65, 147. Iodine, preparation and properties of, 90. Iodized collodion, 58, 59, 60, 131. Iron, perchloride of, 98. " protonitrate of, 97. Jenny Lind stands, 32. Kaolin, properties of, 75.