1278 



INDEX. 



Page. 

 Saville-Kent, W., on composition and cementation 



of Barrier Reef of Australia 796 



Scapolites, alterations and alteration productsof. 312-314, 



374 



occurrence of _ _ . - 312 



sources and mode of formation of . 260, 263, 265, 353, 371 



Scheerer, C. J. A. T., on origin of pegmatites 722 



Schist, definition of - 778,779-781 



photomicrograph of 902 



Schist-arkose, deposits of, origin and character 



of -. 875-876 



Schist conglomerate, origin and character of 857-860 



Schist-graywacke, deposits of, character and origin 



of 883-886 



Schist-pelite, deposits of, origin and character of. 894-904 



Schist-quartzite, character and origin of 868-870 



Schistose tuffs, discrimination between sedimen- 

 tary schistose rocks and 909-913 



Schistosity, display of, by weathering _. 525 



Schists, metamorphic, igneous and sedimentary 



rocks often combined in 911-912 



minerals of, development of — 899 



porphyritic, discrimination of 910-911 



Schloessing, T ., on activity of bacteria, temperature 



favorable to.. 466 



on carbon dioxide the ocean, ratio of, to that in 



the atmosphere 967-968 



Sehurmann, E., on order of disappearance for the 



metals by oxidation 1141 



on precipitation of sulphides 1114,1116 



Scolecite, alterations and alteration products of . . _ 333, 

 334,374,391,401 



chemical and physical constants of 200, 330 



occurrence of -... 331,333 



sources and mode of formation of 262, 



331-333,371,377,397 



Sea, chemical composition of 144 



See also Ocean, 

 Sea-beach deposits of gold, term "placer" used for. 1038 



Sea salt, chemical composition of 942, 943 



Sea water, salts contained in 942 



Seas, inland, tufa deposits of 793 



limestone formations deposited in 793-795 



Seashore regions, disintegration in 500-501 



Secondary enlargement of minerals in rocks, dis- 

 cussion of 619-621 



Secondary enrichment of ore deposits, discussion 



of 1139-1193 



of ores, illustrations of 11S2-11S9 



Secondary fracture, veins produced by 1228 



Sedimentary metamorphosed rocks, relation of 



stratigraphy to 917-921 



Sedimentary ore deposits, enumeration of 1233 



metamorphic alterations of 1039-1043 



edimentary rocks, analyses of 938 



chemical composition of materials of 556-557 



classification of 784-787 



material in solution forming 557-558 



material in suspension forming 556-557, 558 



metamorphosed, and metamorphosed igneous 

 rocks, discrimination between, cri- 

 teria for ,.... 908-917 



ore deposits in 1033-1036 



relations of belt of weathering to _ 555-560 



thickness, volume, and weight of 939-941 



Sedimentation, ores produced by 1037-1043 



Seelheim, F., on pore space in clays 126 



Page. 

 Seepage, amount of, influence of, on ground-water 



level 425 



Segregation, magmatic, ores produced by 1043-1052 



Segregation of individual minerals, discussion of. 645-646 



Segregation of ores, discussion of 1036-1232 



Selective precipitation, discussion of 634-636 



Selenite. See Gypsum. 



Selenium, precipitation of gold by 1092 



Serpentine, alterations and alteration products 



of.... 349-350, 353, 354, 367, 374, 391, 396, 402, 404 



chemical and physical constants of 200,348 



occurrence of _ 349 



penetration of quartz by, figure showing 643 



sources and modes of formation of 219, 



228, 268, 269, 273, 274-275, 278, 285, 286, 288- 

 289. 302, 308-309, 325, 337, 339, 340, 353, 366, 

 371,378,379,380,382,385,387,388,390,391, 

 392, 397, 398, 399, 402, 403, 404, 405, 625 



Serpent inization, example of 646 



Serpentinized graywacke, formation of 881-882 



Serpentinized peridotites, ore deposits in 1047 



Shaler, N. S., on ants, work of, on soils 449 



on igneous and vein material in certain New 



England regions, amount of 127 



on increase of rock volume by cementation, 



metasomatism, and in j ection 654 



on man's work on soil 451 



on trituration of rocks, limit of. 432 



Shaler, N. S., "Woodworth, J. B., and Foerste, A.F., 



on occurrence of graphitic coals 212 



Shales, carbon in 966 



chemical analyses of 890,891,938 



deposits composing.. ._ 892-904 



origin and character of 892-904 



ferruginous, origin of 829-830 



Sharpies, S. P., on chemical composition of corals.. 798 



Shearing, use of term, discussion of 763 



Shrubs, disintegrating effects of, on rocks _ 445 



Siderite, alteration of, to magnetite 845 



alterations and alteration products of 244-245,374, 



378,391,392,405,406 



chemical and physical constants of 200,237 



occurrence of ._ 244 



sources and modes of formation of 226, 229, 233, 



234, 244, 286, 309, 372, 384, 386, 396, 398,408,472, 

 625, 823-829. 

 Siderite and marcasite, alterations and alteration 



products of. 392,406 



Siderite and pyrite, alterations and alteration prod- 

 ucts of.. 392,406 



Siderite and quartz, alterations and alteration prod- 

 ucts of 392,407 



Siderite and rutile, alterations and alteration prod- 

 ucts of 391,400 



Siderite, augite, and magnesite, alterations and al- 

 teration products of 378, 408 



Siderite, gibbsite, magnesite, and microcline, altera- 

 tions and alteration products of . - . 389, 401 

 Siderite, magnesite, and microcline, alterations and 



alteration products of 389, 401 



Siderite, magnesite, and orthoclase, alterations and 



alteration products of . _ 389, 401 



Siderite, magnesite, gibbsite. and orthoclase, altera- 

 tions and alteration products of 389 



Siderite, sahlite, and magnesite, alterations and al- 

 teration products of 391,408 



Sideritic rock, photomicrograph of 836 



