INDEX. 



481 



Graphite, its probable organic origin, 

 13, 301; in Laurentian veins, 210, 

 216 ; in various rocks, 32, 33, 243 - 

 245, 248 ; in aerolites, 301. 



Graptolites of the Levis formation, 258, 

 396, 399, 412. 



Gras on Alpine geology, 332. 



Graywacke defined, 350; of Quebec, 

 396, 397, 401. 



Green Mountain rocks, 18, 29, 32, 241, 

 243, 249, 274. i 



Grenatides, 445. 



Grenville, Quebec, minerals of, 215; 

 section of Cha/.y at, 414. 



Groton, Connecticut, granite of, 186. 



Grove on dissociation, 37. 



Griiner on filling of veins, 203. 



Guano deposits, 225. 



Guelph formation, 417. 



Giimbel on Eozoon, 303, 304; on meta- 

 morphism of rocks, 305 ; on dia- 

 genesis, 305, 321. 



Guthrie on drops, 10. 



Gypsum, origin of, 43, 86, 90; two 

 modes of formation of, 110 ; from bi- 

 carbonate of lime and sulphate of 

 magnesia, 82, 85-87, 90, 109; inter- 

 vention of carbonic acid in its pro- 

 duction, 43, 308; its action on soils, 

 97; does not decompose dolomite, 



Hallowell, Ontario, water of, 116, 142. 

 Halysites in the Trenton limestone, 417. 

 Harlech rocks, 372, 373, 377, 382. 

 Hartt, C. F., on the geology of Brazil, 



278 ; of New Brunswick, 406. 

 Hastings County, Ontario, rocks of, 



216, 274. 



Haughton on the norites of Skye, 281. 

 Heat, internal, of the earth, 7, 9, 15, 43, 



57^59-66, 71, 72,77, 78. 

 Heer, 0., fossil flora of the Alps, 333. 

 Hegel on the chemical process, 450. 

 Helderberg. See Lower Helderberg. 

 Hennessey on the earth's crust, 7, 16. 

 Herkimer County, New York, geology 



of, 413. 



Herschel, J. F. W., on volcanic phenom- 

 ena, 8, 15, 44, 62. 

 Hicks on Cambrian geology, 372, 373, 



375, 384, 409. 

 Hisinger, geology of Scandinavia, 366; 



errors in his works, 258, 366, 395. 

 Hitchcock, C. H., geology of the White 



Mountains, 282. 

 Hoboken, New Jersey, serpentines of, 



248. 



Hoffmann on Eozoon, 303. 

 Homologous or progressive series in 



chemistry, 431, 439, 442. 

 Hoosic Mountain, Emmons on, 250. 



bility in water, insolubility in brines, 

 83, 85, 91, 107-110, 144; occurrence 

 of, in natural waters, 105, 132 ; its 



106 ; is decomposed by hydrous car- Hopkins on the earth's interior, 7, 16, 

 bonate of magnesia, 107; its solu- 



44, 60, 64. 



Hornblende, its decay, 100; association 

 of, with pyroxene, 215; rocks of, 244, 

 246. See Diorites. 



elimination from, by reduction, 99, Houzeau on ozone, 471. 



145; of fresh-water origin, 87; inCal-JHow on mineral waters, 121. 



ciferous sand-rock, 117, 155; in Onon-' Hudson River group, 252, 256, 258, 395, 



daga formation, 132 ; in crystalline' 397, 398, 402, 403; mineral waters 



schists in Sweden, 336; in tertiary from, 116, 124, 156. 



in the Alps, 345. See Anhydrite. Huggins, his spectroscopic studies, 35. 



HAIDINGER on pseudomorphism, 324. 



Hall, James, on sources of palaeozoic 

 sediment, 49; on mountains, 51, 

 53 - 55, 73 ; on White Mountain rocks, 

 271; on Potsdam rocks, 389; on New 



Humbolclt on granites, 190. 



Huronian rocks, 18, 29, 243, 269, 272, 

 274; their identity with the Urs- 

 cheifer, 269. See Green Mountain 

 series. 



Hutton on metamorphism, 24; on pri- 



York geology, 387, 389, 404 ; oifj mary schists, 338. 

 rocks of Georgia, Vermont, 402; on I Hydrocarbon gases, 8, 112, 131, 182. 

 Taconic fossils, 392; on American I Hydrochloric acid, its volcanic origin, 

 palasozic nomenclature, 419. I 8, 15, 44 ; in mineral waters, 111. 



