Ice: melted, 95, 96; never melted, 163, 164. Imbrian Sea, 151. Insects, 224, 250. (See _Ants_, _Bees_.) Iron: melting, 19, 107; appearance of cold, 25; in sun, 28; in man, 221; in stars, 236, 237. (See _Steel_.) Ironstone, 188. Ivy, 115. Janssen’s Observations, 61. Jevons, Professor, 80. Joseph in Egypt, 90. Jumping, 241, 242. Jupiter, 79, 118, 124, 127–129, 156, 185, 229. Kensington Museum, 221. Kepler, on Comets, 219. Kernels, 220. Kew, 88. Kirchoff’s Researches, 12. Krakatao, 181, 185, 186. La Harpe, quoted, 207. Landscape, 169. Langley, Prof. S. P.: drawings, 15, 16, 18, 19, 21, 22, 25, 28, 30; note-book, 24; expedition, 180; study of Reflection, 216. (See _Allegheny_, _Pittsburg_.) Latent Power, 220. Laws of Nature, 250, 251. Leaf-like Appearances, 23. (See _Willow_.) Lenses, 102, 103; Galileo’s, 123. Leo, 195, 197. Liais’s Drawing, 48, 50. Lick Glass, 123. Light: development, 13; day and night, 35; white (_q. v._), 48; mental (see _Eye_), 71; from balloon, 179; transmitted, 227. (See _Sun_.) Lightning, 75, 76, 242, 244, 245. (See _Electric_.) Lily, 73. (See _Flowers_.) Limited Express Train, 5. Loaf-sugar, experiment, 188. Lockyer’s Land, 130. Lockyer’s Solar Physics, 59, 61, 236, 238. Lombardy, 151. London, 111. Lost Pleiad (_q. v._), 207. Louis XV., 42. Louis XVI., 221. Lunar Alps (_q. v._), 148, 149. (See _Moon_.) Lunar Apennines (_q. v._), 153. Lunar Shadows, 36, 37, 39, 56. Lyrids, 196, 200. Macartney’s Lens, 103. Maelstrom, 27. Magic Lantern, simile, 220. Magnesium, 236, 237. Magnetic Needle, 81, 82, 84, 85, 87, 89. Mammoth Cave, 40. Man, chemistry of, 221, 233. (See _Humanity_.) Manhattan Island, 111. Mare Crisium, 143. Mare Serenitatis, 143, 144. Mars, 118, 128–132, 148. Mason’s Publication, 137. Matterhorn, 148, 167. Mayflower, 5. Meadows, 172. Mecca, 175. Medusa, 228. Memnon, 234. Mercator, 163, 165. Mercury, 3, 118, 136, 229. Messier, anecdote, 207. Metals, melted, 103. (See _Iron_.) Metaphysics, 70, 71. Meteorites: around Saturn, 124; recent, 187; lawsuit, 187, 188; analyzed, 191, 192; in Iowa, 199, 200; swarm, 200; cracking, 211. Meteors, 98, 175–198; (1868), 189. (See _Falling_, _Shooting_.) Meunier’s Investigations, 192. Mexican Gulf, 38. Microcosm, 222. Micromegas, 223. Microscope, 224. Middle Ages, 91, 175. Milky Way, 224, 225. Milton, quoted, 14, 38. Mind-causation, 70, 71. Mirror, 102, 107. Mississippi, 134. Mites, 224. Mizar, 207. M’Leod’s Drawing, 44. Monochromatic Light (_q. v._), 63. Montaigne of Limoges, 207. Mont Blanc, 156. Monte Rosa, 167.