INDEX. 



1247 



Page. 

 Ankerite, formation of sahlite from, chemical reac- 

 tion involved in. 837 



sources and modes of formation of. 242-243, 625, 823-829 

 Ankerite and parankerite, alterations and alteration 



productsof 376 



Ankerite and quartz, alterations and alteration 



productsof _ 376,407 



Ankerite, parankerite, and quartz, alterations and 



alteration products of . 376 



Anorthite, alteration of, to gismondite, volume 



change incident to 633 



alteration of, to thomsonite, volume change in- 

 cident to 633 



alterations and alteration products of.. 260, 



261. 264, 367, 372, 376, 377, 402, 404 



chemical and physical constants of _ 195,259 



occurrence of 259-260 



sources and modes of formation of 260, 264, 367 



Anorthite, trisilicic, alterations and alteration prod- 

 ucts of 262 



chemical and physical constants of . . 201 



Anorthite, albite, and leucite, alterations and alter- 

 ation products of _ 375, 376, 386, 397 



Anorthite, albite, and microcline, alterations and 



alteration products of 389 



Anorthite, albite, and orthoclase, alterations and 



alteration products of 375, 377, 389, 404 



Anorthite and albite, alterations and alteration 



productsof 375,376,377.397,398 



Anorthite and calcite, alterations and alteration 



productsof 377,400 



Anorthite and hematite, alterations and alteration 



productsof. ._ 377,402,404 



Anorthite and olivine, alterations and alteration 



productsof _ 388,408 



Anorthoclase, alterations and alteration products of 258- 

 259, 369, 370, 371, 372, 377, 398 



chemical and physical constants of 195,253 



occurrence of 257-258 



sources and modes of formation of _ 258 



Anorthoclase and gibbsite, alterations and altera- 

 tion productsof.. 377,400,401 



Anorthoclase, hematite, and calcite, alterations and 



alteration products of _ 377 



Anthon, E. F., on order of disappearance of the 



metals on oxidation 1141 



on precipitation of sulphides 1114,1116 



Anthophyllite, alterations and alteration products 



of. _ 282,372,377,378,404 



chemical and physical constants of 195, 281 



occurrenceof 281-282 



sources and modes of formation of _ 268, 



270, 271, 282, 309, 310, 354, 369, 379, 382, 3S8, 399, 406 



Ants, work of. on soils 448,449 



Apatite, alterations and alteration products of 356, 



372,378 



occurrence of _. 356 



chemical and physical constants of. _ 195,356 



Aphrosiderite, chemical and physical constants of 195, 327 



sources and modes of formation of 303, 



304-305, 369, 376, 3S3, 390, 404 



Apo, definition of term _ __ 776-777 



Apophyllite, alterations and alteration product of. 333, 

 334,372,378,401 



chemical and physical constants of . . . 330 



occurrence of _ 331-333 



Aqueous solutions, ascending, ores precipitated 



from 1072-1139 



Tage. 

 Aqueous solutions, ascending and descending, ores 



precipitated from ___ 1139-1193 



circulation of 1021-1029 



descending, ores precipitated from 1193-1199 



formation of 59 



metamorphic work of _. 63-158 



minerals now in course of deposition by 1059-1060 



ores deposited by 1058-1234 



metals of, sources of -. _. 1069-1072 



modification of, by gaseous solutions.. 1239 



precipitation of minerals by reactions between 116-119 

 precipitation of minerals by reactions between 



gases and. __ 119 



source of water of _ _ 1065-1069 



work of, in segregating ores 1072-1199 



Aragonite, alterations and alteration products of . . 245- 

 246,372,378,399 



chemical and physical constants of 195,245 



occurrenceof 245 793 



sources and modes of formation of _ 245 



Arches in strata, influence of, on ore deposition' 1211-1216 



Arctic regions, disintegration of rocks in 498-499 



Arfvedsonite, alterations and alteration products 



of 289,372,378 



chemical and physical constants of _ 195,283 



occurrenceof 285 



Argentite, alteration of, to silver sulphite, equation 



showing _ lie; 



formation of, equation showing H68 



Argillite, association of gold with 1095,1096 



losses in, by weathering, analyses showing .510, 515, 522 



Arid regions, accumulation of alkalies in 545-546 



disintegration of rocks in 497 



ground-water level in, as affecting depth of ore 



deposits _ _ 118O 



soils of, composition of _ 497.498 



Arizona, copper deposits of, secondary enrichment 



of- 1184 



Arkansas, limestone from, losses in, by weather- 

 ing 513,523 



syenite from, losses in, by weathering, analyses 



showing.. 508,522 



Arkansas River, ground water of, rate of flow of . .. 584 

 Arrhenius, Svante, on climatic effect of increased 

 amount of carbon dioxide in atmos- 

 phere 464 



Arkose, deposits of, origin and character of _ 874-875 



Arkoses, metamorphosed, discrimination of 909-910 



Arkose-gneiss, depositsof, originandcharacterof . 875-876 

 Arkose-schist, deposits of, origin and character of. 875-876 



Artesian water, flow of, loss of head in 142 



Artesian wells, section showing requisite conditions 



for 577 



Ascending aqueous solutions, ores deposited by 1072- 



1139,1235 

 See also "Water, ground, ascending. 

 Ascending and descending aqueous solutions, ores 



deposited from 1139-1193,1234,1235 



Aspen district, Colorado, silver-lead deposits of, 



theory of formation of _ 1084 



Atmosphere, chemical composition of _ 944 



percentage of known matter of globe formed 



*>y - - 933 



Auge, on bauxite deposits __ 985 



Augite, alterations and alteration products of 273 



277-280, 372, 378, 397. 399, 40S 



chemical and physical constants of 195,271 



occurrenceof. __ _ 272 



