INDEX 



Palaeozoic Period, The, 199 



Palaeozoic Alps, The, 219 



Pareiasaurus, The, 232 



Parsons, Hon. Charles, on the difficulties of deep boring, 79 



"Pea-grit," 238 



Peak Cavern in Derbyshire, 195 



Pearl-oyster, The, 210 



Peat-water, The action of, 48 



Pelee, Mount, 86, 108; the obelisk, 184 



Permian or Dyas formation, 227 



Peroxide of Iron, 40 



Perseids, 99 



Pharorackus, The, 251 



Pithecanthropes erectus, 285 



Planetismals or Meteorites, 99 



Plant life in the Silurian Period, 210 



Plants, Era of the first, 103 



Pleiades, The, 91 



Pleistocene Period, The, 269 



Plesiosaurus, The, 234, 239 



Pliny on the upheaval of land, 192 



Pliocene Period, The, 257 



Po, Sediment deposited by the River, 20 



Polyps, Coral, 65 



" Pot-holes" in Yorkshire, 195 



Pre-Cambrian, 201 



Pressure, of air, 80 ; of the ocean, 190 



Pressure and weight of rocks, 85 ; astounding effects of, 134 



Pribylof Islands, 164 



Proboscideans, The, 273 



Proterozoic era. The 130 



303 



