INDEX OF SUBJECTS. 



5 6l 



N 



Naphtha, 253 



Nebular theory, 79, 153, 167 

 North America, volcanoes of, 273 

 Norway, geology of, 117 

 Nummulites, 257 



Ocean, sediments in, 215 



Oceanography, 182, 213, 215 



Oligocene formation, 534 



Oolitic series, 497 



Ophite, 102 



Organisms, geological action of, 239 



et seq. 

 Organs, geological, 204 



Palaeontology, 125 et seq., 363 et 



seq. ; also see Fossils 

 Palaeozoic strata, 436, 448 

 Paris basin, geology of, 104 

 Peat, 240 



Pebbles, formation of, 212 

 Permian system, 453 et seq. 

 Petrography, 122 

 Petroleum, 253 

 Planets, 157 



Pleistocene formation, 538 

 Porphyritic rocks, 324, 337, 345, 



348, 351 



Porphyritic structure, 337 

 Pre-Cambrian rocks, 439 

 Protozoa, 383 et seq. 

 Pyrenees, geology of, 101 



Quaternary formation, 538 



R 



Radiolaria, fossil, 385 

 Raised beaches, 286 

 Red clay, 217 



Reptiles, fossil, 133, 415 

 Rhine, volcanoes of, 258 

 Rhon, volcanoes of, 268 

 Rivers, action of, 207 et seq. 

 Russia, geology of, 119 



Salt deposits, 219, 485, 490 

 Salt Lake, 218 

 Sand-dune, 199 

 Sand-pipes, 204 

 Santorin Isles, 267 

 Scandinavia, geology of, 115 et seq. 

 Schists, 353 et seq. 

 Scotland, geology of, 113; volca- 

 noes of, 270 

 Sea, invasion of land by, 212 et seq., 



286 



Sea-level, fluctuations of, 292 

 Secular movements of upheaval, 285 



et seq. 

 Sedimentary strata, origin of, 351, 



426 



Sedimentation, 303 

 Sediments in ocean, 215 

 Seismometers, 282 

 Serapeum, changing level of, 289 

 Silurian system, 433 et seq., 441 et 



seq. 



South America, volcanoes of, 275 

 Spain, geology of, 108 

 Spectroscope, 154 

 Sponges, fossil, 129, 386 et seq. 

 Springs, 200 



Stars, falling, 163; fixed, 187 

 Stratigraphy, early, 37, 49, 59; 



later, 84 et seq., 88, ill, 425 et 



seq. 



Sun, constitution of, 156 

 Sun-spots, 156 

 Surfusion, theory of, 342 

 Swallow-holes, 204 



Tectonic structure, 295 et seq. 

 Teeth, fossil, 410, 413 

 Tertiary system, 105, 526 et seq. 

 Thuringia, geology of, 82, 83, 85 



