Index 



Ordovician rocks, 69, 70, 210. 

 " Outcrop," 64. 

 Oxygen, 30. 



Pacific ocean, currents of, 52. 

 Palaeozoic rocks, 67, 69. 

 Paradoxides, 210. 

 Pec fen asper^ 85. 

 Pentlandite, 294. 

 Permian rocks, 69, 120. 

 Planetesimal hypothesis, the, 24 et seq. 

 Planets, the, 20. 



origin of, 22. 



Pleistocene rocks, 68, 69. 

 Pliocene rocks, 68, 69, 78, 80. 

 Productu s giganteu s, 154. 

 Pterinopecten papyraceu j, 184, 192. 

 Pyrrhotite, 294. 

 Pythagoras, 6. 



Quartz, 59. 



pebbles, 112, 114. 



secondary, 285. 



veins containing minerals, 284, 289. 

 Quartz-porphyry, 257, 259. 



Radium, 26, 27. 



Rainfall, 37. 



Raised-beach terraces, 81, 83. 



Rastrites, 204. 



River, the, 90-107. 



windings of, 98. 

 Roches moutonne'eS) 257, 262. 

 Rock salt, 297. 



boring for, 119, 137, 181, 183. 

 Rock-sections, making of, 106. 

 "Rock-trains," 265, 266, 271. 

 Rocks, geological periods of, 68. 



kinds of, 57 et seq. 



Sand, 76. 



glazing action of, 109, 112, 114. 

 Sand-dunes, 87. 

 Sandstone, 85. 



red, 112, 114, 115. 

 Saturn, 20, 21. 

 Sedimentary rocks, 57, 58, 61. 



Serac, a, 270, 273. 



Shale, 6 1, 123, 124. 



Shingle, 76, 84, 88. 



Silicates, 60. 



Silurian rocks, 69, 152, 153, 154, 204, 



210. 



Slate, 61, 62. 

 Smith, William, 16, 66. 

 Snowfield, a, 273, 274. 

 Solar system, the, 20 et seq. 

 Spectroscope, 18. 

 Springs, hot, 245. 

 Stars, light of, 18. 

 Staurocephalus, 152. 

 Stigmaria^ 130. 

 "Strike "of rocks, 64. 

 Sun, the, 19, 20. 

 Syncline, 64, 65, 105. 

 Syringopra ramulosa, 143. 



Temperature of the earth, 26. 



Thrust-planes, 211, 212. 



Tides, 53. 



Tin-ore, discovery of, 278. 



Tin-stone, 258, 278, 284. 



Trade winds, 35. 



Triassic rocks, 68, 69, 206, 209^210. 



Trilobites, 152, 210. 



Tufa, a, 155, 156, 161. 



Unconformity, an, 121-122, 153. 

 Uniformity, Smith's doctrine of, 66, 



Valley, section across, 105. 



Vedas, 4. 



Volcanic eruption, a, 221, 222, 224 et 



seq. 

 Volcano, inspection of, 226, 233, 



254. 

 Vulcanists, the, 16. 



Waterfalls, 118, 145, 146, 155. 



Water-sink, a, 171. 



Werner, Abraham Gottlob, 15. 



Winds, 33-37. 



Winter, life in, 180-189. 



301 



