Chicago: great fire, 134; astronomer, 233. China: lens, 103, 104; soil, 180. Chlorophyl, 73. Chocolate, simile, 107. Cholera, 80. Chromosphere, 7; clouds, 62; forms, 64–68. Cinders, 171. Clark’s Glasses, 123. Cliffs, 164. Clock, 135. Cloud-ocean, 179. Clouds: cirrous, 27, 28; beautiful, 54; and rain, 111; formed, 249. Coal-beds, 115. Coal: energy, 73–75, 111; destroyed, 97; wasted, 101; stock, 112. Cobweb, simile, 26. Cold: and eclipses, 40; in planets, 136. Colorado, 50. Colors: in eclipses (_q. v._), 65; mental, 70, 71; in Jupiter (_q. v._), 127; in moon (_q. v._), 168; in stars (_q. v._), 227; spectrum (_q. v._), 236. Comet-hunters, 204, 207. Comets: chapter, 199–220; Donati’s, 201, 204, 205, 207, 209, 217; one part, 203; parts and name, 208; tail (_q. v._), 208, 211; diameter and parts, 216; spectroscope, elements, dread, 219; numerous, stone, 219, 220; kernel, 220; (1858), 213–216; (1866), 200. Common, A. A., 239, 247. Compass, 86. Connecticut Observations, 186, 242. Converter, 104–108. Coral, 151. Corn, 111. (See _Grain_.) Corona, 7, 36, 37, 40, 41, 43, 45–52, 55, 56, 59, 60–62. Cotton-mill, 74. Counting, 94. Cracks, celestial, 163. Craters, 164. (See special names.) Crystalline Structure, 4, 23–27. Cyclones, 24, 31, 32, 68. Decay, 248, 249. Delambre’s History, 207. De la Rue’s Engraving, 125. Delfthaven, 5. Denning’s Theory, 197. Diamonds, melted, 103. Dies Iræ, 249. Dipper, 207, 208. (See _Great Bear_, _Polar_.) Diurnal Oscillation, 87. Dog, anecdote of, 42. (See _Animals_.) Donati, 201, 204, 205, 207, 209, 213, 217. (See _Comets_.) Double Stars, 233. Draper, Professor Henry, 128, 246, 247. Ducks, noise, 188. Dust, 34, 100, 101, 102, 105, 197. Dynamite, 182, 185, 220. Earth: relations, 3, 4; description difficult, 6; temperature (_q. v._), 34, 101; a string of earths, 96; stars like, 118; seen from outside, 133–135; craters, 148. Earthquakes, 220. (See _Charleston_.) Earth-shine, 167, 172. Eclipses: total, 7, 37; screen, 36; three, 39, 55; partial, 40; singular gloom, 39–43; causing fright, 43; colors (_q. v._), 48, 56, 61, 65, 66; (1842), 41; (1857), 48; (1869), 39, 40; (1870), 44, 61; (1871), 50, 66, 68; (1878), 38, 50, 57, 58. (See _Total_.) Egypt, 116, 234. (See _Pyramids_.) Electricity, 13, 75, 76. Electric Light, 7. Electric Spark, 242. (See _Lightning_.) Electric Storm, 84, 85, 88. Elizabeth, Queen, 115. Engine-power, 98, 111. England: fleets, 2; coal, 115. (See _Britain_, _London_.) Engraving, 17. Enigma, 228. Ephemera, 250, 251. Equatorial Landscape, 13, 17, 18, 47.