INDKX. 



Aar, torrent of, 45. 



Abbott, C. C. on early man, 282. 



Abyss of the ocean, 58 ; receives little 

 sediment, 66. 



Acervularia, 181. 



Acids in the air, 224. 



Adirondacks, features of, 108. 



Mtna, Mount, 87 seq.', eruptions of, 88. 



Agassiz and Drift, 15, 45. 



Age of the world, 288, seq. 



Ages of man, 284. 



Air-breathers of Coal period, 175, 245. 



Alaskan mammoth, 158. 



Amoaba, 200. 



Amphibians, reign of, 72; characters 

 of, 176; diminution of, 247 ; a com- 

 prehensive type, 259. 



Andrews, E. on Geologic time, 292. 



Ant-eater, Banded, 252. 



Anthracite, 151. 



Anticipation in organic structures, 

 258. 



Anticlinal explained, 76, 77; in oil 

 accumulation, 137. 



Aphanite, 40. 



Appalachian region, 267. 



Appalachians, origin of, 246. 



Archseopteryx, 261. 



Archegosaurus, 247. 



Argillite, 40 ; primitive, 225. 



Argonauta, 185. 



Artesian wells, 96,70; bored for salt, 132. 



Assortment of sediments, 46, 187. 



August meteors, 211. 



Azoic seon, 230. 



Bad Lands, 55; fossils of, 162 seq.; 



description of, 162. 

 Ball, R. 8., on primitive tides, 232. 

 Bar of Mississippi, 49. 

 Basaltic columns, 94. 

 Basin of a geyser, 81. 

 Basin Province, 267. 

 Basins of Great Lakes, 279. 

 Beaches, ancient, of lakes, 41 ; of sea 



shore, 275, 276. 



Becker, G. P., on Comslock lode, 123. 



Bedded, thin or thick, 63. 



Belodon, 248. 



Bilateral symmetry, 193. 



Birds, reptilian, 252, 260, 261; gene- 

 alogy of, 262. 



Bituminous coal, 152. 



Bog iron ore, 35, 126, 128. 



Bonanza defined, 120. 



Bowlders described, 13 ; enormous ex- 

 amples of, 16; most abundant 

 northward, 17; sources of, 17, 18; 

 direction of transportation of, 21, 

 23. 



Bowlder clay, 20. 



Brachiopods, 189, 193, 234, 242. 



Brains of early mammals, 254. 



Brandon frozen soil, 99. 



Brontotheriurn, 257. 



Brontozoum, 248. 



Brown coal, 153. 



Burns gas well, 145. 



Caenozoic, Great System, 78; 



Times, 252 seq.; mammals, 254 teq. 

 Caking coal, 152. 

 Calabrian earthquakes, 103, 104. 

 Cambrian, System, 72 ; fossils, 190 seq.; 



rocks, 192, 196. 



Cannel coal, 152 ; formation qf , 246. 

 Cafions, result of erosion, 54. 

 Carbonic acid, in the air, 243 ; removal 



of, 244. 

 Carboniferous System, 72; fossils, 173 



seq.; Age, 241. 

 Carinate birds, 262, 298. 

 Caspian Sea and salt, 130 seq. 

 Cat family, 297. 

 Catskill Mts. described, 54. 

 Caucasus, buried ice in, 99. 

 Caverns for human homes, 284. 

 Cement of teeth, 155. 

 Centrifugal tendencies, 215, 216. 

 Centripetal tendencies, 215. 

 Cephalaspis, 238, 239. 

 Cestraciont sharks, 236, 238. 



(323) 



