Colour of a Body, and its Magnetic Properties, 197. Colours and Tints, Chevreul on, 37. Colours most frequently hit in Battle, 36. Comet, the, of Donati, 240, 241. Comet, Great, of 1843, 84. Comets, Magnitude of, 84. Comets visible in Sunshine, 84. Computation, Power of, 10. Coney of Scripture, 137. Conic Sections, 10. Continent Outlines not fixed, 145. Corpse, How soon it decays, 237. “Cosmos, Science of the,” 10. Crosse, Andrew, his Artificial Crystals and Minerals, 216-219. Crosse Mite, the, 218. Crystallisation, Reproductive, 26. Crystallisation, Theory of, 24. Crystallisation, Visible, 25. Crystals, Immense, 24. “Crystal Vault of Heaven,” 55. Davy, Sir Humphry, obtains Heat from Ice, 190. Davy’s great Battery at the Royal Institution, 204. Day, Length of, and Heat of the Earth, 186. Day’s Length at the Poles, 65. Declination of the Needle, 197. Descartes’ Labours in Physics, 9. Desert, Intense Heat and Cold of the, 163. Dew-drop, Beauty of the, 157. Dew-fall in one year, 157. Dew graduated to supply Vegetation, 157. Diamond, Geological Age of, 122. Diamond Lenses for Microscopes, 40. “Diamond,” Newton’s Dog, 8. Dinornis elephantopus, the, 139, 140. Dinotherium, or Terrible Beast, the, 136. Diorama, Illusion of the, 37. Earth and Man compared, 22. Earth, Figure of the, 21. Earth, Mass and Density of, 21. Earth’s Annual Motion, 12. Earth’s Magnitude, to ascertain, 21. Earth’s Surface, Mean Temperature of, 23. Earth’s Temperature, Interior, 116. Earth’s Temperature Stationary, 23. Earth, the, a Magnet, 197. Earthquake, the Great Lisbon, 121. Earthquakes and the Moon, 121. Earthquakes, Rumblings of, 120. Earthquake-Shock, How to measure, 120. Earth-Waves, 119. Eclipses, Cause of, 74. Egypt, Alluvial Land of, 110. Electric Girdle for the Earth, 224. Electric Incandescence of Charcoal Points, 204. Electric Knowledge, Germs of, 207. Electric Light, Velocity of, 209. Electric Messages, Time lost in, 225. Electric Paper, 209. Electric Spark, Duration of, 209. Electric Telegraph, Anticipations of the, 220-224. Electric Telegraph, Consumption of, 224. Electric Telegraph in Astronomy and Longitude, 225. Electric Telegraph and Lightning, 226. Electric and Magnetic Attraction, Identity of, 210. Electrical Kite, Franklin’s, 213. Electricity and Temperature, 208. Electricity in Brewing, 209. Electricity, Vast Arrangement of, 208. Electricity, Water decomposed by, 208. Electricities, the Two, 214. Electro-magnetic Clock, Wheatstone’s, 211. Electro-magnetic Engine, Theory of, 210. Electro-magnets, Horse-shoe, 199. Electro-telegraphic Message to the Stars, 226. Elephant and Tortoise of India, 135. End of our System, 92. England in the Eocene Period, 129. English Channel, Probable Origin of, 105. Eocene Period, the, 129.