486 



INDEX. 



Pyrites, iron, origin of, 230. 

 Pyrognomic minerals, 6. 

 Pyrophyllite rocks, 28. 

 Pyroschists, 169, 176-179. 

 Pyroxene, 25, 186, 215, 216. 

 Pyroxenites, 31, 207. 



QUARTZ, its origin, 2; conditions of 



crystallization, 6, 204, 205; chalce- 



donic, 89; crystalline sands of, 89; 



veins of, 192-194, 196, 199; rounded 



crystals of, 213. 



Quartzite, supposed intrusive, 242. 

 Quebec, geology of, 256 -259, 390, 396- 



403 ; probably inverted section at, 



413. 

 Quebec group, 155, 259, 398, 401; its 



relation to the Trenton, 413 ; mineral 



waters from, 155. 

 Quincite, 296. 



RADICLES in chemistry, 428, 466, 467. 

 Ramsay, A. C., on dolomites, 92; on 



stratigraphical breaks, 376; on the 



geology of North Wales, 374, 380, 



381, 383. 

 Red sandrock of Vermont, 260, 390, 



391, 394. 



Rivers, waters of, 84 - 86, 126. 

 Rocks, porosity of, 103, 164; subaerial 



decay of, 2, 10, 41, 101-103; recom- 



posed, 251, 285, 339, 341. 

 Rogers, H. D., on crystalline rocks of 



Pennsylvania, 245; on Taconic, 254; 



on Cambrian, 374, 381, 422. 

 Rogers, H. D. and W. B., on geology 



of the White Mountains, 242, 276; on 



nomenclature of palaeozoic rocks, 



420-422. 

 Rogers, W. B., on geology of Virginia, 



275; on protozoic rocks in Massa- 

 chusetts, 405. 



Rounded crystals, 212, 213. 

 Royal Institution, 45. 

 iJutliind, Vermont, geology of, 265. 



SAKFORD on geology of Tennessee, 265 

 Saginaw, Michigan, brines of, 120. 

 Saliiiu formation. See Onondaga. 

 Salter, J. W., on geology of North 

 Wales, 854, 362, 364, 371, 372. 



Salt wells of Goderich, Ontario, 204. 



Sands, silicious, crystiuune and chalce- 

 donic, 89. 



Salt lagoons, 86. 



Saratoga, waters of, 102, 149. 



Saussurite, 445. 



Scandinavia, geology of, 209, 257, 263, 

 266 - 269, 376, 385. 



Scapolite, 28, 101, 210, 446. 



Schaeffer, G. C., on nitrification, 472. 



Scheerer, Th., on granites, 5, 65, 189; 

 on envelopment of minerals, 291 ; on 

 polymeric isomorphism, 291, 315, 

 318, 442. 



Schiel, James, on progressive series in 

 chemistry, 439. 



Schonbein on nitrification, 471. 



Scotland, Highlands, geology of, 34, 

 271, 272, 338. 



Scrope, Poulett, on water in igneous 

 rocks, 5, 65, 66, 190; on volcanoes, 

 60. 



Sea-salt, its origin, 2, 12; its deposi- 

 tion, 76, 83, 86, 107, 120, 310. 



Sea-water. See Ocean. 



Sea-weed. See Fucoids. 



Sedgwick, A., on geology of Anglesea, 

 270, 273; of North Wales, 350-365; 

 on the Cambrian series, see Cam- 

 brian ; on recomposed rocks, 341 ; 

 on systems in geological classifica- 

 tion, 377 ; his views misrepresented, 

 357, 364, 365 ; his classification of 

 lower palaeozoic rocks, 384 ; his 

 death, 349. 



Sediments, sources of, 10, 49, 75; re- 

 lated to mountains, 51, 73; conden- 

 sation of, by heat, 56, 71 ; conversion 

 of, to crystalline rocks, 4, 7-9, 14- 

 16, 25-27, 43, 56, 57, 62-64, 284, 

 285, 317. 



Selwyn, A. R. C., on deposition of gold, 

 237 ; on geology of Victoria, Austra- 

 lia, 273; on geology of Nova Scotia, 

 408. 



Senarmont, H. de, on artificial forma- 

 tion of minerals, 221. 



Sepiolite, 123, 296, 300; its relations to 

 steatite, 317, 318. See Magnesian 

 silicates. 



Serpentine, Laurentian, 31, 34 ; of Green 



