Equatorial Telescope, 122. Ericsson: engravings, 112, 113; discoveries, 163. Eruptive Promontories, 66–68. Etna, 164, 181. Europe, size, 25. Evolution, planetary, 139. Explosive Forces, 182–194. Eye, 71, 227. Eye-pieces, 47, 63. Fabricius’s Observations, 8. Fact and Fancy, 175. Factory, 73. Faculæ, 32, 33. Falling, 242, 243. Falling Stars, 193. (See _Meteors_, _Shooting_.) Faraday, Michael, 76. Fault, technical term, 156. Faust, 139. Faye: theory, 29–32; on Comets’ Tails, 212. Fern-like Forms, 25, 26. Filaments, 25–27, 30, 55, 56, 65, 66, 68. Fire, in sun (_q. v._), 92. (See _Flames_, _Heat_.) Fixed Stars, 233. Flame-like Appearances, 23, 24. Flames, 65, 66, 69, 185. Flashes, 189, 195. Flax, 111. Flowers, color (_q. v._), 70. (See _Rose_, _Plants_.) Foliage-forms, 32. Fontenelle’s Story, 133. Forbes’s Observations, 38, 39. Frankenstein, 221. Franklin’s Discoveries, 76. Fraunhofer Studies, 235. French Institute, 186. Frost-crystals (_q. v._), 23. Furnaces, 101. Galileo, 8, 121–123, 139, 140. Gas: glowing, 44; in sun, 60. Gas-jets, 40, 61, 68, 88. Gassendi’s View, 172, 173. Gelinck’s Observations, 80. Geminids, 196. Genii, 193. Geographers and Geologists, 133. Glare, 14, 18, 62–64. Glass: spun, 26; globe, 145. Glow-worms, 7, 117. Good Hope Observations, 80. Gould’s Researches, 80. Grain, prices, 77, 80, 87. (See _Corn_, _Sun-spots_, _Wheat_.) Gramarye, 92. Grass-blades, 66, 72. Grasses, 26. Gravitation, 72, 203; negative, 215. Great Bear, 207. (See _Dipper_, _Polar_.) Green’s Maps, 130. Greenwich Observatory, 2, 81, 82, 84, 85, 88, 89. Gulliver’s Travels, 131, 132. (See _Swift_.) Gunpowder, 186. Guns, 135. (See _Cannon-ball_.) Hall Island, 130. Hall, Professor, 131. Hand, illustration, 168. Harkness’s Observations, 44. Harvests, 90. Hastings, Professor, 60. Heat: development, 13; concentration, 19; loss, 29; confinement, 33; sensation, 71; vibrations, 72; energy, 91; amount, 92, 97; computation, 94–96; diminution, 101; emission, 102; storage, 111; in sugar, 188. (See _Flames_, _Sun_.) Hecla, 164, 181. Hedgehog-spines, simile, 68. Helmholtz’s Estimates, 98. Hengist and Horsa, 1. (See _Britain_.) Hercules, 238. Herschel, Sir John: sun-spots, 12–14; electric storms, 88; comet’s tail, 216. Herschel, Sir William: avoidance of light, 18; prices, 79; sun-spots (_q. v._), 129. Herschel’s Outlines, 11. Holden, Professor, 124. Honeycomb Structure, 30. Huggins’s Experiment, 234, 235. Humanity, deified, 172. Human Race, 250. Humboldt, 195. Humming-bird, 70. Hunt, Professor, 136, 219. Hydrogen, 68, 99, 237. Ibrahim, King, story, 194, 195.