INDEX. 



455 



Ocean, agency of, in rock-making, 56. 

 " swallowing up the land, 399. 

 " as a conductor of heat, 404, 444. 

 Ohio oil regions, 288. 



" salt rocks, 305. 

 Oil, something about, 273. 

 " excitement, 273. 

 " mistaken opinions about, 275. 

 " smellers, 275. 



" accumulation, conditions of, 287. 

 " regions of United States, 292. 

 " springs, Ontario, see Enniskillen. 

 " wells, flowing, list of, 443. 

 Old fields, 252, 260. 



" Red Saudstone, 131, 439. 

 Onondaga salt formation, 303. 

 Ontario, Lake, geology of, 225. 

 Oolitic reptiles, 188. 

 Opisthocoelian vertebrae, 188. 

 Orbitoides, nature of, 69. 

 Order of Nature temporary, 3S2. 

 Orders of animals, 103. 

 Ordinal groups, succession of, 316. 



" types, 324. 

 Oreodon Culbertsoni, 208. 

 Organic types, succession of, 315, 316. 

 Orient the birthplace of man, 362. 

 Oriskany sandstone, 126. 

 Ormoceras tenuifilum, 115. 

 Ornaments in primeval times, 359. 

 Ornithichnites, 168, 182. 

 Orographic outlines of N. America, 96. 

 Orpheus on the Great Year, 3S3, 3S4. 

 Orthoceratites, 109, 115, 120, 316. 

 Oscillations of the land, 19. 



" in United States, 22. 



" in ancient times, 152. 



" use of, in coal-making, 161. 



Ostracoid crustaceans, 318. 

 Outlet of lakes formerly obstructed, 242. 

 Ovid, quotation from, 39. 

 Owen, D. D., on Potsdam sandstone, 79. 

 " " " Mesozoic geology, 210. 

 " " " Kentucky geology, 255. 

 " " portrait of, 211. 



Pachyderms, 203. 



Packard, A. S., on primeval man, 360. 



Paint Creek and petroleum, 276. 



Palceophycus arthrophycus, 83. 



Palceotherium, 202. 



Paleozoic Time, 73. 



Paradozides Harlani, 76. 



Paris, fossils of, 202. 



Passing events speak of the past, 238. 



Pearly Nautilus, 114. 



Pea/, how prepared, 237. 



" oil from, 282. 

 Pebbles, glacial, 218. 



" formed by water, 223. 

 Pecopteris, 163. 

 Pelorosaurus, 188. 

 Pendleton mine, 439. 

 Pennsylvania oil regions, 2S8. 

 Pentacrinus, 41, 107. 

 Percussion a source of heat, 410. 

 Perfectibility of the race, 372. 

 Perigord in primeval times, 354, 357. 



Periodical destructions and renovations, 



381, 

 Periods, ages, and epochs, 133. 

 Periods, geological, not always vast, 369. 

 Permian Period, 171. 

 Perpetual motion, 390. 

 Perpetuity — where is it ? 423. 

 Persians on destructions by fire, 386. 

 Petite Anse, salt deposit of, 306. 

 Petroleum, something about, 273. 



" as an evidence of organiza- 



tion, 67, 281. 

 Petroleum, illusory ideas about, 275. 

 " characters of, 280. 



" in all formations, 281. 



" artificially produced, 281. 



" distilled from shale, 281. 



" causes of its flow, 284. 



" quantities of, discharged, 286. 



" prices of, 2S6. 



" accumulation, conditions of, 



287. 

 Petroleum regions in U. States, 288, 292. 

 Phascolotherium, 189. 

 Phoenix, fable of, 386. 

 Phyllotaxy, 328. 

 Physics, wonders of, 422. 

 Pictou, reptiles at, 169. 

 Pictured Hocks, Lake Superior, 85. 

 Pile-habitations, 352, 360, 364. 

 Piles of London Bridge, etc., 256, 257. 

 Pines succeeding hard-wood forests, 252. 

 Plan, see Method. 



Plans of animal structure, 101, 175, 314. 

 Planets, genesis of, 44. 



" may still be thrown off", 44. 

 " periodic times of, 329- 

 Plants before auimals, 66. 

 " first tree-like, 127. 

 " appearing in new localities, 250. 

 Plato on catastrophes, 386. 

 Plesiosaurus, 178, 179, 318. 

 Plum-seed long preserved, 262. 

 Poisson on cooling of the earth, 403. 

 Polyps and coral reefs, 326, 327. 

 Polypterus, 320. 

 Popol Vuh of the Aztecs, 38T. 

 Porcupine Mountains, 339. 

 Porites, 327. 



Portage Lake, Lake Superior, 85. 

 Portland (Connecticut) quarries, 182. 

 Positivism in geologic theory, 434. 

 Pot-holes in ancient river-beds, 269. 

 Potsdam group, 76. 



" sandstone in New York, 77. 

 " " extension of, 78, 94. 



" period, climate of, 105. 

 Pouillet on central heat, 403. 

 Poulp, 111. 

 Power, Madam, 111. 

 Prairie, sketch of, 264. 

 Prairies and their treelessness, 264. 



" origin of, 266. 

 Prehistoric man, 351. 

 Primeval storm, 55. 

 Primordial earth, 3S, 307, 30S. 

 Problems ever present to man, 3S0. 

 Procession of organic forms, 315. 



