Adelsberg, Caverns of, 195 _Æpyornis_, The, 252 "Age of Lakes," The, 257 Air, how it may become solid, 84 Aleutian Islands, Volcanoes of the, 97 Algæ, 103 Alluvium, 54 America in the Devonian Period, 217; in the Glacial Period, 271 Ammonites, 210 Amœba, The, 100 Andes, Volcanoes of the, 97 Andesite, 184 Andromeda, 92 Animal Life, The first, 104 Animal Species of the Carboniferous Period, 229 Ant, White, The work of the, 44 Anthracite, 133 Apes, The first, 268 _Apteryx_, The, 252 Archæan Era, 129, 199 _Archæopteryx_, The, 243 _Archelon, The_, 249 Arches, The strain on, 25 Aristotle and Earthquakes, 176 Armadillos, 275 Arrhenius, Prof., Theory of, 88 _Arsinoitherium_, The, 266 Assam, Earthquake in, 155 Atmosphere, has the Moon one? 123; of Mars, 126 Atmospheric pressure, 80, 101 Attraction of bodies, 102 Austen, Sir W. R., his experiment, 85 Avalanches, 69 Babylon, 45 Bacteria in Devonian Period, 217 Baikal, Lake, effects of earthquake, 140 Baltic, Ice in the, 74 Barometer, The use of the, 24 Basalt Rocks, 132 "Beds of Passage," 236 Birds of the Jurassic Period, 243 Bogoslof Islands, 162 Borings, Deep, 79 Boulder-clay deposited by glaciers, 73 _Brachiosaurus_, The, 241 Brahmaputra, The delta of the, 60 Britain in the Silurian Period, 211; in the Mesozoic Period, 231 British Isles, Ice in the, 75 _Brontosaurus_, The, 240 Cainozoic Period, The, 199 Calabria, Earthquake in, 149 _Calamites_, 222 Calumet and Hecla Mine, Temperature of, 82 Cambrian Hills, The, 200 Cambrian Period, 117; life in the, 202; surface of the globe in, 205 Carbonate of Lime, 40, 48 Carbonic Acid, The action of, 47 Carboniferous or Mountain Limestone, 218 Carboniferous Period, The atmosphere of, 219; insects, mollusca, vegetation, 220; fish, 224; strata, 226; animal species, 229 Carboniferous System, Extent of the, 227 _Cariama_, The, or Screamer, 251 Carinthia, Earthquake in, 141 Carrara marble, 134 Cephalopod types, 207 _Ceratosaurus_, The, 240 Chalk, what it is, 21, 248 _Chelonians_, The, 233 Climate, The changes of, 33 Coal, 219 _Coccosteus_, The, 215 Collision of planets, A, 93 Constructive work of earthquakes, 181 Coral Islands, 66 Coral reefs, 63 Coral reefs in the Silurian Age, 210 _Coryphodon_, The, 259 Cracks in the crust of the Earth, 97 Crater Lakes, 109 _Crinoids_, The, 210 Crustacea, 131, 202 Crust of the Earth, The study of the, 198 Cyclones, 42