INDEX. 



ACCUMULATION of sediments, effects 

 of, 17, 49, 58, 66. 



Acid springs, 111; of New York and 

 Ontario, 130, 131. 



Acids of volcanoes, their origin, 8, 15, 

 111, 112. 



Adams, C. B., on the geology of Ver- 

 mont, 391. 



Adirondack Mountains, rocks of, 32, 

 241, 243. 



Aerolites, constitution of, 302. 



Agalmatolite rocks, 67. 



Albertite, composition of, 176. 



Albite, in Laurentian veins, 214; for- 

 mula of, 443. 



Albuminoids, constitution and arti- 

 ficial production of, 170. 



Algce. See Sea-weeds. 



Alkalies, relative proportions in waters, 

 102; of mineral waters, 135. See 

 Carbonate of Soda and Potash. 



Alkaliferous silicates, decomposition 

 of, 2, 10, 40, 102, 103. 



Alkaline silicates, soluble, 7, 21, 25. 



Alkaline waters, 85, 123, 156. 



Alleghany River, brines of, 121. 



Allomerism, 447. 



Alps, geology of, 328; anthracitic sys- 

 tem of, 332 ; grand section of, 

 343. 



Alteration of rocks. See Metamor- 

 phism. 



Alum slates of Sweden, 266, 366. 



Alumina, solution and deposition of, 

 13, 14, 98, 142; sulphate of, 98, 133; 

 in waters, 142. See Bauxite. 



Aluminous silicates, origin of, 28, 296, 

 298. 



Ammonia of volcanoes, 8, 15, 113; 



in rocks and soils, 113 ; nitrite of, its 

 production, 471. 



Andalusite rocks, 28, 32, 34, 243, 272, 

 282, 408. 



Andrews, E. B., on petroleum, 174. 



Angelin, Paloeontologica Scandinavica, 

 367. 



Anglesea, crystalline schists of, 270, 

 353, 383. 



Anhydrites of the Alps, 335. 



Anhydrous monobasic acids, 464. 



Anorthite, its formula, 443. 



Anortholite, 31, 32. 



Anthracite, its origin, 177 ; of the Alps, 

 332, 334. 



Anticlinals, their relations to moun- 

 tains, 53. 



Anticosti, geology of, 416. 



Anticosti group, 417. 



Apatite, 197, 208, 211, 213, 311. 



Appalachians, geology of, 50, 51, 75, 

 241. 



Aquatic vegetation, 2, 22, 95. 



Arendal, vein-stones of, 209. 



Arenig rocks, 375, 376, 381, 384. 



Arkesine, 330. 



Arkose, 285. 



Artesian wells of London and Paris, 

 85. 



Aspidella Terranovica, 410. 



Atmosphere, primeval, 1, 20, 40, 42, 47, 

 301. 



Atmospheric waters, 94. 



Atomic hypothesis, 433, 438. 



Atomic volumes, 433, 435, 440, 455. 



Attrition of rocks, 20. 



Auroral rocks, 247, 421; their rela- 

 tion to matinal, 414. 



Azoic gneisses of Rogers, 246. 



