488 



INDEX. 



Sulphurets, origin of, 23, 111, 230; 



soluble, in natural waters, 145, 159 - 



163 ; action of, on clays, 99. 

 Sulphuretted hydrogen, 8, 15, 87, 99, 



163, 230. 



Sulphuric acid in waters, 111, 112, 130. 

 Sulphurous acid, origin of, 8, 15, 



111. 



Sun, constitution of, 36, 37. 

 Sweden, genlogy of. See Scandinavia. 

 Syenite defined, 184, 185. 

 Syracuse, New York, brines of, 119; 



serpentine cf, 310. 



TABLE, of porosity of rocks, 166; of 

 lower palaeozoic formations, 386. 



Tachydrite, 108, 118. 



laconic system, 155, 251-254, 264, 

 326, 388," 389, 391, 394; fauna of, 257, 

 391; distinguished from primary, 

 251, 326; synonymous with Lower 

 and Middle Cambrian, 389. 



Talc. See Steatite. 



Talcose schists, 244-249, 251, 330- 

 838, 341, 343, 383; their supposed 

 pseudomorphic origin, 316, 320, 325. 



Temperature of Earth's surface, see 

 Climate ; of Earth's interior, see 

 Earth, its interior. 



Tennessee, copper veins of, 217, 250; 

 geology of, 255. 



Terranovan series, 194, 275, 276. See 

 Montalban and White Mountain se- 

 ries. 



Terrestrial circulation, 22, 225, 235. 



Teton Mountains, geology of, 262. 



Thenardite, its formation, 108. 



Thermal waters, 1.17. 



Thompson, Sir William, on the earth's 

 interior, 44, 77. 



Tin, 238. See Cassiterite. 



Titanium, 31, 192, 200, 210, 238, 251, 

 280. 



Topsham, Maine, veins of, 194. 



Tourmaline, 196, 200, 212. 



Trachytes of Canada, 186 



Transmutation of minerals, 313, 325. 



Travertines, origin of, 89. 



Trebrn, Von, on altered rocks, 339. 



Trcmadoc rocks, 853, 369-372, 374- 

 876, 381, 412. 



Trenton formation, 256, 412-414, 417; 



mineral waters from, 116, 123, 124, 



155, 156, 158. 

 Treve on magnetism, 61. 

 Troy, New York, geology of, 407. 

 Trinidad, bitumen of, 176. 

 Tschermak on feldspars, 444. 

 Tuscarora, Ontario, water of, 130. 

 Tyndall, J., on heat-radiation and cli- 



"mate, 42, 46. 



URSCHIEFER of Scandinavia, age of, 



18, 269; gypsum in, 336. 

 Utica formation, 256, 421 ; a pyroschist, 



178; mineral waters from, 124, 156, 



157. 



VALORSIXE, Switzerland, conglomer- 

 ate of, 339. 



Vapors, relations of, to solids and 

 liquids, 456. 



Varennes, Quebec, waters of, 124. 



Vegetable matter. See Organic matter. 



Vegetation. See Organic life. 



Veins, distinguished from dikes, 193, 

 202; fossils in, 203; pebbles in, 204; 

 banded structure of, 193, 211 ; forma- 

 tion of, 233 ; recent origin of some, 

 234. See Granitic vein-stones and 

 analysis of Essay XI., 183. 



Vermont, geology of, 256-266, 390- 

 395, 402. 



Verneuil, De, on American palaeozoic 

 rocks, 419. 



Vichy, water of, 85. 



Victoria, Australia, geology of, 273. 



Virginia, geology of, 249, 255, 276, 407. 



Vital forces, 224, 235. 



Voelcker, action of water on soils, 95. 



Voellknerite. 289. 



Volcanoes, phenomena and causes of, 

 8, 15, 44, 62-64, 77, 111; interven- 

 tion of water in, 5, 61, 63, 65; distri- 

 bution of, and relations to the newer 

 formations, 9, 17, 67, 67, 68, 71; his- 

 torical relations of, 68: Hall on, 68; 

 Herschel, J. F. W., on, 8, 15, 44, 66, 

 62, 71; Keferstein on, 16, 56, 62. 71; 

 LeConte on, 72, 77 ; Mallet on, 78, 79. 



Volger on the filling of veins, 202 ; on 

 pseudomorphism, 287, 324, 325. 



