Jerusalem, Temple of, How protected from Lightning, 167. Jew’s Harp, Theory of the, 29. Jupiter’s Satellites, Discovery of, 80. Kaleidoscope, Sir David Brewster’s, 43. Kaleidoscope, the, thought to be anticipated, 43. Kircher’s “Magnetism,” 194. Leaning Tower, Stability of, 15. Level, Curious Change of, 144. Leyden Jar, Origin of the, 216. Lifting Heavy Persons, 17. Light, Action of, on Muscular Fibres, 34. Light, Apparatus for Measuring, 32. Light from Buttons, 36. Light, Effect of, on the Magnet, 198. Light from Fungus, 36. Light from the Juice of a Plant, 35. Light, Importance of, 34. Light, Minuteness of, 34. Light Nights, 35. Light, Polarisation of, 33. Light, Solar and Artificial Compared, 29. Light, Source of, 29. Light, Undulatory Scale of, 30. Light, Velocity of, 31. Light, Velocity of, Measured by Fizeau, 32. Light from Quartz, 51. Lightning-Conductor, Ancient, 167. Lightning-Conductors, Service of, 166. Lightning Experiment, Fatal, 214. Lightning, Photographic Effects of, 45. Lightning produced by Rain, 166. Lightning, Sheet, What is it?, 165. Lightning, Varieties of, 165. Lightning, Various Effects of, 168. Log, Invention of the, 173. London Monument used as an Observatory, 103. “Maestricht Saurian Fossil,” the, 141. Magnet, Power of a, 195. Magnets, Artificial, How made, 195. Magnetic Clock and Watch, 211. Magnetic Electricity discovered, 199. Magnetic Hypotheses, 193. Magnetic Needle and the Chinese, 194. Magnetic Poles, North and South, 201. Magnetic Storms, 202. “Magnetism,” Kircher’s, 194. Malachite, How formed, 124. Mammalia in Secondary Rocks, 130. Mammoth of the British Isles, 133. Mammoth, Remains of the, 134. Mars, the Planet, Is it inhabited?, 82. Mastodon coexistent with Man, 135. Matter, Divisibility of, 14. Maury’s Physical Geography of the Sea, 170. Mediterranean, Depth of, 176. Megatherium, Habits of the, 135. Mercury, the Planet, Temperature of, 82. Mer de Glace, Flow of the, 110. Meteoric Stones, no Fossil, 92. Meteorites, Immense, 91. Meteorites from the Moon, 89. Meteors, Vast Shower of, 91. Microscope, the Eye, Brain, and Hair seen by, 41. Microscope, Fish-eye, How to make, 40. Microscope, Invention of the, 39. Microscope for Mineralogists, 42. Microscope and the Sea, 42. Microscopes, Diamond Lenses for, 40. Microscopes, Leuwenhoeck’s, 40. Microscopic Writing, 42. Milky Way, the, Unfathomable, 85. Mineralogy and Geometry, Union of, 25. Mirror, Magic, How to make, 43. Moon’s Attraction, the, 73. Moon, Has it an Atmosphere?, 69. Moon, Life in the, 71. Moon, Light of the, 70. Moon, Mountains in, 72. Moon, Measuring the Earth by, 74. Moon seen through the Rosse Telescope, 72. Moon, Scenery of, 71. Moon and Weather, the, 73. Moonlight, Heat of, 70.