1262 



IXDEX. 



Page. 



Heat, metamorphic effect of 51-56 



phenomena of, in chemical action .54, 105-110, 182,208,362 

 production of, by mechanical action in rocks, 



importance of, in metamorphism. .54, 99-100 

 relation of, to chemical and mechanical action. 110-113 



work of, in ground-water circulation 147-149 



Heat toning of chemical reactions, mathematical 



statement of - 106 



Heat and gravity, work of, in ground-water circula- 

 tion -— 148-149 



Heat and light, metamorphic effect of 51-56 



Hedenbergite, occurrence of 272 



chemical and physical constants of. 197,271 



Hematite, alterations and alteration products of -.. 226- 

 227,373,377,379,384,401,402,408 



chemical and physical constants of 197,223,842 



formation of, chemical equations showing. . . 830, 1126 

 from cupric sulphate and ferrous sulphate 

 solution, chemical equations show- 

 ing - H02 



from iron carbonate, chemical equations 



showing 844 



from siliceous siderite, etc., chemical equa- 

 tions showing.. 830 



formation of magnetite from, chemical reac- 

 tion involved in _ 846 



residual deposits of 1039 



sources and modes of formation of 214, 225-226, 



227, 229, 233, 242, 244, 245, 268, 269,282,303, 

 309, 313, 328, 342, 370, 375, 376, 377,378,379, 

 384, 3S5, 3S6, 387, 390, 391, 398, 399,400,404, 

 405, 467, 468, 623, 830, 843-845, 846, 1102, 1126 



specular, origin of 844-845 



Hematite and anorthite, alterations and alteration 



products of 377,402,404 



Hematite and biotite, alterations and alteration 



products of 379,396,398,401 



Hematite and meiorite, alterations and alteration 



products of 387,402 



Hematite, anorthoclase, and calcite, alterations and 



alteration products of 377 



Hematite, calcite, and microcline, alterations and 



alteration products of 389, 401 



Hematite, calcite, and orthoclase, alterations and 



alteration products of 389, 401 



Hematite-schist, origin of. 845 



Henrich, C, on ore deposits of Ducktown, Tenn 1182 



Hercynite, chemical and physical constants of 198 



source of - 370 



Hess, W. H., on origin of nitrates in cavern earths. 543 

 Heterogeneous and homogeneous chemical systems, 



notes on _7_. 90-91 



Heulandite, alterations and alteration products of. 333, 

 334,373,384,400 



chemical and physical constants of _ 198,330 



sources and modes of formation of _ 262, 



331-533,370,375,376,397 



High lands, disintegration of rocks in 499-500 



Hilgard, E. "W., on amount of soluble salts con- 

 tained in soils in California 545 



on decomposition of rocks in arid regions 501 



on decomposition of silicates in calcareous and 



noncalcareons soils _ 477 



on endurance of plants to alkalies 478 



on soils of arid regions 497 



Hill, R. T., on systems of circulating underground 



water 578 



Hillebrand, W. F., and Clarke, F. "W., on chemical 



action in solutions, theory of _ 68 



on chemical composition of slate 895 



on rock analyses 693 



on rocks of Pigeon Point, Minn. 733 



on water content of rocks, relation of, to crys- 

 tallization. 743,744 



Hills, R. C, on ground-water level in Cripple Creek 



district. 1172 



Hinde, G. J., on cherts of organic origin 847 



on silicification at Spitsbergen 646 



Hitchcock, Edward, on schist conglomerates 859 



Hobbs, W. H., on enlargement of mineral particles. 644 



on regeneration of mineral particles 705 



Hobbs, W. H., and Culver, G. E., on decomposition 



of olivine-diabase in South Dakota ._ 560 



Hoff, J. H. van't, on heat of chemical reactions 107 



on osmotic pressure 72, 74 



on reactions 90 



on solutions. 74 



on thermal effects of chemical reactions at high 



and low temperatures 168 



Homogeneous and heterogeneous chemical sys- 

 tems, notes on 90-91 



Hoover, H. C, on ore deposits of western Australia. 1185- 



1186 

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

 Hornblende, alterations and alteration products 



of.— 285-286, 287, 288, 289, 290, 373, 384, 385, 398 



chemical and physical constants of 198,283 



fragment of, cut showing enlargement of _ _ 626 



occurrence of ._ 284-285 



sources and modes of formation of... 274,279,285,303, 

 305-306, 370, 376, 378, 383, 387, 390, 396, 408, 625-627 

 Hornblende and quartz, alterations and alteration 



products of .-_ 385,399,405 



Hoskins,L. M.,on flow and fracture of rocks _ 671 



Hoskins,L. S., on shearing of rocks 763 



Howell, E. E., on warm or hot springs of Cordilleran 



region 591-592 



Hubbard, H. L., on hydrous silicates in the Lake 



Superior region 1130 



Hudson schists, igneous and sedimentary rocks 



combined in _ 912 



Human influences on groimd-water level, charac- 

 ter of 427-428 



Humic acid, formation and action of, in soils 462-463 



Humid regions, decomposition of rocks in 501-502 



level of ground water in, as affecting depth of 



ore deposits 1180 



Humidity, importance of, in decomposition of 



rocks 501-502 



Humites, alterations and alteration products of.. 325, 



373,385,403 



chemical and physical constants of 198, 325 



occurrence of.. 325 



Hunt, T. Sterry, on carbon dioxide formerly in at- 

 mosphere 964r-965 



on carbon dioxide of mineral springs, source of. 678 

 on carbon dioxide segregated from interstellar 



spaces by gravitation _ 973 



on origin of pegmatites 722 



on silica in underground water _ 476 



Huttonian principles of geology, application of, to 



metamorphism 35-36 



reversal of, as applied to metamorphism 36-37 



Hyalosiderite, chemical and physical constants of . . 199 



