1284 



INDEX. 



Page. 

 Van Hise, C. R., and Leith, C. K., on igneous intru- 

 sions as an agency in producing iron- 

 silicate rocks 840 



Valley filling, influence of, on ground- water level .. 426 

 Variations in metamorphism within a single dis- 

 trict, discussion of. _. 917-921 



Varnish, desert, reference to 547 



Vegetation, carbonation of soils promoted by 477 



ground- water motion as affected by... 152,417,432-423 

 rock decomposition and solution by... 444-447,505-506 



upward transfer of material by 550 



Vein quartz, figure showing.. 1156 



Venezuela, diabase from, losses in, by weathering. 508. 



509,522 

 Vermiculite, alterations and alteration products 



of. 



353 



source and mode of formation of 337, 353, 372, 388 



Vertical movement of ground water, limits of ... 579-580 

 Vesuvianite, alterations and alteration products 



of-- 315,374,393 



chemical and physical constants of 201,315 



occurrence of 315 



Virginia, diorite from, losses in, by weathering 510, 



515,522 

 gneiss from, losses in, by weathering, analyses 



showing 508 



pyroxenite from, losses in, by weathering 510 



Viscosity of solutions, importance of degree of, in 



ground -water circulation 153 



Viscosity of water, decrease of, with increase of 



depth from surf ace 578-579 



decrease of, with increase of temperature. . 140-141, 153 



table showing, for various temperatures 141 



Vogt, J. H. L., on cassiterite, deposition of 1127 



on ore deposits, production of, from igneous 



rocks 1044,1049-1050,1051 



on ores deposited from gaseous solutions 1054 



on precipitation of silver by ferrous iron of sili- 

 cates _ 1101 



Volcanism, effects of, on ore deposition 1014-1017 



Volcanoes, carbon dioxide emitted by 969 



vapors from, soiirces of 492 



Volume, changes in, chemical reactions as affecting 93, 

 170-171, 18:2-1 S2, 208-211, 375-408, 632 



changes in, metasomatism as affecting 632 



weathering as affecting 523-524 



diminution of, in rocks 101-104 



pressure, effects on 363-365 



~\V. 



Wadsworth, M. E., on casehardened sandstones 547 



Walcott, C. D., on source of silica for marine or- 

 ganisms 848 



Walker, T. L., on nickel ores of Canada 1046 



Wall rocks, ore shoot formation as affected by. 1086-1088, 



1229 



Wallich, G-. C, on cherts of organic origin 847 



Walther, Jonannes, on deposits of ferromagnesian 



sands. 877 



on disintegration of rocks by changes in tem- 

 perature 437,439 



Washington, H. S., Cross, Whitman, Iddings, J. P., 

 and Pirsson, L. V., on mineral compo- 

 sition of amphibole-gabbro -632 



Washington, Monte Cristo, district of. See Monte 

 Cristo district. 



Water, combined, in rocks, proportion of 123 



deep, deposits made in, compared with deposits 



made in shallow water 1134 



dissociation and dissociative power of 66-67.86 



dissociation of salts by 73 



expansion of, with increase of temperature 149 



flow of, through rock openings 137-146 



gravitative action of, metamorphism by 50 



ground, ascending, carbon dioxide "exhaled 



by 970-971 



ascending, deposits by, criteria for discrimi- 

 nating H32_H38 



first concentration of ores by 1079 



descending, deposition of ores by 1079. 1080 



circulation of, forces producing 146-152 



See also Ground water, 

 hot, work of, in solution and recrystallization.. 692 

 in minerals, granulation and recrystallization 



as affected by 741-748 



in belt of cementation, condition of 566-569 



in mines, features of. 1132-1134 



in rocks, amount of 123, 934, 937, 938, 9S1-983 



metamorphism as affected by... 41 



in zone of anamorphism, condition, quantity, 



and surfaces of 659-662 



miscibility of, with rock magma 114-115,723 



movement of, below zone of anamorphism 668 



of the ocean, source of 953 



pressure necessary at different temperatures to 



maintain liquidity of 440, 568 



shallow, deposits made by, compared with de- 

 posits made in deep water 1134 



surface, concentration of soluble materials by 551-554 



work of, in metamorphism 432 



viscosity of, at different depths from earth's 



surface 578-579 



at different temperatures 141 , 153 



Water bubbles in rocks, figure showing 746 



Water gas, in zone of anamorphism, action of 660-661 



penetration of rocks by 144-145 



Water solutions, metamorphism by 602-656 



pressure range at which work is done by 603 



temperature range at which work is clone by ._ 603 

 Watson, T. L., on losses of granites by weathering. 523 



on weathering of granitic rocks of Georgia 520 



Wavellite, chemical and physical constants of 198 



Weathering, acids going into solution during .... 536,537 



additions made to rocks in 523 



belt of, alterations in, contrasted with those of 



belt of cementation 166-167 



belt of oxidation coincident with 1142 



carbon dioxide in, amount of _ 474 



chemical reactions in 163-166, 451-488 



circulation in 416-423,1018,1023 



definition of 162,163,409-411 



gases in, circulation of 1018 



limits of 43,529 



material abstracted from, by run-off 538-539 



material dissolved and reprecipitated in.. 539-554 



materials and conditions in 429,431 ' 



mechanical work in __ 164,431-451 



metamorphism in _ 429-527 



agencies of 64,430-431 



mineral concentration in 541 550 



openings in, promotion of second concentra- 

 tion of ores' by _. 1177-1179 



