INDEX. 



455 



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

 &quot; swallowing up the land, 399. 

 &quot; as a conductor of heat, 404, 444. 

 Ohio oil regions, 288. 



&quot; salt rocks, 305. 

 Oil, something about, 273. 

 &quot; excitement, 273. 

 &quot; mistaken opinions about, 275. 

 &quot; smellers, 275. 



&quot; accumulation, conditions of, 287. 

 &quot; regions of United States, 292. 

 &quot; springs, Ontario, see Enniskillen. 

 &quot; wells, flowing, list of, 443. 

 Old fields, 252, 200. 



&quot; Red Sandstone, 131, 439. 

 Onondaga salt formation, 303. 

 Ontario, Lake, geology of, 225. 

 Oolitic reptiles, 188. 

 Opistbocoelian vertebras, 188. 

 Orbitoides, nature of, 09. 

 Order of Nature temporary, 382. 

 Orders of animals, 103. 

 Ordinal groups, succession of, 316. 



&quot; types, 324. 

 Oreodon Culbertsoni, 208. 

 Organic types, succession of, 315, 316. 

 Orient the birthplace of man, 362. 

 Oriskany sandstone, 126. 

 Ormoceras tenuifdum, 115. 

 Ornaments in primeval times, 359. 

 Ornithichnites, 168, 182. 

 Orographic outlines of N. America, 96. 

 Orpheus on the Great Year, 383, 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. 

 &quot; &quot; &quot; Mesozoic geology, 210. 

 &quot; &quot; &quot; Kentucky geology, 255. 

 &quot; &quot; portrait of, 211. 



Pachyderms, 203. 

 Packard, A. S., 



* i^iv^v., ^. ^., on primeval man, 360. 



Paint Creek and petroleum, 276. 



Palceophycus arthrophycus, 83. 



Palceothcrium, 202. 



Paleozoic Time, 73. 



Parad&xides Harlani, 76. 



Paris, fossils of, 202. 



Passing events speal 



Pearly Nautilus, 114. 



Peat, how prepared, 237. 



&quot; oil from, 282. 

 Pebbles, glacial, 218. 



&quot; formed by water, 223. 

 Pecopteris, 163. 

 J elorosaurus, 188. 

 Pendleton mine, 439. 

 Pennsylvania oil regions, 288. 

 Pentacrinus, 41, 107. 

 Percussion a source of heat, 410. 

 Perfectibility of the race, 372. 

 Perigord in primeval times, 354, C57. 



Periodical destructions and renovations, 

 381. 



eriods, ages, and epochs, 133. 

 eriods, geological, not always vast, 309. 

 ermiau Period, 171. 

 erpetual motion, 390. 

 erpetuity where is it ? 423. 

 ersians on destructions by fire, 386. 

 elite Anse, salt deposit of, 306. 

 Petroleum, something about, 273. 



&quot; as an evidence of organiza 

 tion, 67, 281. 



J etroleum, 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, 286. 



accumulation, conditions of, 

 287. 



etroleum regions in U. States, 288, 292. 

 ^hascolotlierium, 189. 

 hoenix, fable of, 386. 

 hyllotaxy, 328. 

 ^hysics, wonders of, 422. 

 &quot;ictou, reptiles at, 169. 

 ictured Rocks, Lake Superior, 85. 

 ile-habitatious, 352, 360, 364. 

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

 ines succeeding hard-wood forests, 252. 

 Plan, see Method. 



lans of animal structure, 101, 175, 314. 

 Planets, genesis of, 44. 



may still be thrown off, 44. 

 periodic times of, 329. 

 r lants before animals, 66. 

 &quot; first tree-like, 127. 



appearing in new localities, 250. 

 Plato on catastrophes, 386. 

 Plesiosaurus, 178, 179, 318. 

 Plum-seed long preserved, 262. 

 Poissou on cooling of the earth, 403. 

 Polyps and coral reefs, 326, 327. 

 Polypterus, 320. 

 Popol Vuh of the Aztecs, 387. 

 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. 



&quot; 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. 



&quot; origin of, 266. 

 Prehistoric man, 351. 

 Primeval storm, 55. 

 Primordial earth, 38, 307, 308. 

 Problems ever present to man, 380. 

 i Procession of organic forms, 315. 



