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302 *Hagen, J. G., 29
 * Haggard, Rider, Sir, 165, 166
 * Hale, G. E., 99, 121–126, 137, 221, 222, 230
 * Halley, E., 27, 28, 36–40, 162, 267, 268
 * Halley's Comet, 19, 38–40, 201–202
 * Halos round Star images, 251
 * Hamburg, 107
 * Hansky, 214–218
 * Harvard Observatory, 97, 178
 * Heath, J. (of Royal Inst.), 64, 175, 176
 * Heat of Sun, 206–211
 * Height of Mountains in Moon, 184–187
 * Helium, 79
 * Hencke, 155
 * Herschel, Caroline, 95, 107
 * Herschel, William, 93–96, 107, 156, 198
 * Hertz, 169
 * Hevelius, 91
 * Hodgson, R., 198, 199, 215, 224
 * Hollis, H. P., 39
 * Home Rule, 146, 147
 * Honeymoon in Space, 4, 164
 * Hooke, R., 25–28
 * Horrox, J., 62–64
 * Huggins, Sir W., 212, 218, 271
 * Hydrogen on Sun, 220–223


 * Icaromenippus, 1
 * Illustrated London News, 204
 * Image in Telescope, 111–113
 * Iron filings and magnet, 220


 * Japanese Eclipse, 119, 237
 * Jerusalem, 40
 * Jockey, 111, 112
 * Josephus, 39
 * Juno, 155
 * Jupiter, 147–149, 152, 157, 180, 202, 231
 * Jupiter's Satellites, 109, 164–169, 179, 231


 * Kapteyn, J. C., 289, 291
 * Kelvin, Lord, 210, 211
 * Kepler, 16–21, 27, 153
 * Kinematograph, 287
 * King Solomon's Mines, 165
 * Kish-wau-ke-toc, 110
 * Kites, 67, 75, 76


 * Ladies of Mount Wilson Staff, 124
 * Layers of Air, 67
 * Lens, 102
 * Leonid Meteors, 203–206
 * Leverrier, U. J., 159–164, 178
 * Lick, James, 107–109
 * Lick Observatory, 70, 107, 116, 180
 * Life on Planets, 140–146, 187
 * Light, Velocity of, 89, 168, 250
 * Light-years, 262, 282, 283
 * Liquid Air, 140, 188–191, 266
 * Los Angeles, 99, 127
 * Lowell, Percival, 142–144
 * Lucian, 1
 * Maelstrom, 222
 * Magdeburg Hemispheres, 64, 65
 * Magnetic Storms, 228, 229
 * Magnetism of Sun, 219–223
 * Magnifying power, 111
 * Magnitudes of Stars, 257, 258
 * Mars, 69, 70, 106, 138–148, 152, 157, 180, 187
 * Mars, Moons of, 106
 * Matilda, Queen, 40
 * Maunder, E. W., 224–230
 * Maundeville, Sir J., 54
 * Maxwell, J. Clerk, 149, 150, 169
 * McClean, Dr. F., 115
 * Melotte, P. J., 180, 181
 * Mercury, 157, 295
 * Meteorological Office, 67, 78
 * Meteors, 79–85, 200–206
 * Meteors causing Sunspots, 200–206
 * Migrating, 284–294
 * Milky Way, 251, 291, 292
 * Minor planets, 152–156
 * Mirror, 92-98, 103
 * Momentum, Angular, 176–177
 * Mont Blanc, 88
 * Moon, 2–4, 13, 21, 47–56, 86, 87, 157, 165, 173–174, 182–188, 225