Dead Sea, The, 58 Deltas of rivers, 20 Deposits, how they are made, 20, 45 Depths of the sea, 189 Devonian Period, 212; fishes of the, 216; vegetation, 216; insects, 216; Europe and America, 217 Diamonds, how they are produced, 132 _Dinoceras_, The, 266 _Dinosaurus_, The, 240 _Diplodocus_, The, 241 _Dolichosaurs_, 249 Dover, The chalk cliffs of, 21 Dredging, The necessity for, 20 _Dryopithecus_, The, 268 _Dryptosaurus_, The, 253 Dwina, Fossils in the banks of the, 232 Dykes, 105 Earth, The, not so solid as it looks, 23; its resemblance to a golf ball, 25; its uneven surface, 31 Earth, Weighing the, 88 Earthquake districts, 171 Earthquake, The sensation of an, 137; the cause of an, 166, 170 Earthquake waves, 174 Earthquakes, 23; San Francisco, 140; New Madrid, 140; Lake Baikal, 140; Iceland, 141; Carinthia, 141; Japan, 141; Ocean, 143; Lisbon, 148; Sicily, 149; Chili, 150; Assam, 156; Jamaica, 157; the Mississippi, 158; Sonora, 160; Yakutat Bay, 160 Earthquakes, "Great" and "Small," 172; their constructive and destructive work, 181 Earthworm, The work of the, 44 _Edentata_, The, 275 "Egg-stone," 236 Eifel District, Crater Lakes of the, 109 _Elasmotherium_, The, 265 Elephant, The, 260 _Elephas Imperator_, 280 Emu, The, 260 Encroachment of the sea on the shores of the British Isles, 17 Eocene Period, The, 257 _Eohippus_, The, 263 Eoliths, 287 Era of the First Plants, 103 Erosion, Sea, 19 "Erratic" blocks deposited by glaciers, 72 Eulalie, Lake, effect of earthquake on, 142 Europe in the Devonian Period, 217 Evolution, 115 Excavations and what they reveal, 34 "Faults," 167 Fish in the carboniferous period, 224 Flint, 248 Flint implements, 288 Florida, Encroachment of the sea on the coast of, 18 Flying Reptiles, 242 "Foliated" rocks, 200 _Foraminifera_, 247 Forests covered by the sea, 19 Fossils, 131; in the banks of the Dwina, 232 Fossil records, 56 Fumaroles, 185 Ganges, The Delta of the, 20 Gases, How metals may be converted into, 84 "General Metamorphism," 133 Geologist, The work of the, 37 Geology, 37 Germany, Sand-dunes in, 46; Ice in, 74 Geysers, 141 Giant's Causeway, 132 "Gibraltar Skull," The, 286 Ginkgo Tree, 228 Glacial Period, The, theories concerning, 272 Glaciers, 69, 270 _Globigerina bulloides_, 247 _Glyptodon_, The, 275 Gneiss, 200 Grand Cañon of the Colorado, 54 Graphite, 133 Great Barrier Reef, 66 Great Salt Lake, 57 _Hadrosaurus_, The, 253 Harwich, Encroachment of the sea at, 17 Hawaii, Lava eruptions in, 105, 187 Heat and Cold, 68 Heligoland, Encroachment of the sea on, 18 _Hesperornis_, The, 249 Horse, The, 259, 264 Hurricanes, 43