1264 



INDEX. 



Page. 



Igneous rocks, relations of stratigraphy to .. 922-934 



See also Igneous intrusion. 

 Igneous work, character and extent of, in belt of 



cementation - 646-652 



in zone of anamorphism 707-736 



relations of, to chemical and mechanical work 



in metamorphism 653-655 



See also Igneous intrusion. 

 Ilmenite, alterations and alteration products of.. 227-228, 

 373,385,386,405,408 



chemical and physical constants of ... 198-223 



occurrence of 227 



sources and modesof formation of 227, 



231, 355, 370, 389, 391, 400, 405 

 Ilmenite, calcite, and quartz, alterations and altera- 

 tion products of - 385,408 



Imbibition, capacity of rocks for, an index: to power 



of transmission 155 



water of, definition of 124,155 



Impervious strata, effect of, on ore deposition 576-578, 



1207-1211 

 Induration of rocks, subsurficial, by injection of 



molten magma 647 



surficial, method of 546-549 



Injection, igneous, in belt of cementation 646-652 



igneous, in zone of anamorphism 707-736 



Inorganic compounds, oxidation of.. 466-469 



Insolation, conditions favorable to 438 



importance of topography in _. 439 



origin of term .. 437 



resistance of rocks to, varying power of „ 439 



Insoluble compounds, precipitates formed by 540-541 



Intruded rocks, composition of, a factor in meta- 

 morphism __ 713-715 



Intrusion, igneous, manner of, in zone of anamor- 

 phism 708-710 



igneous, metaniorphic effects of 42,54, 



488-494, 646-652, 716-736, 1014-1017 



metamorphism resulting from 711 



minerals formed by __ 717-720 



temperature effects of __ 712 



water present during effects of 712-713 



work of, in belt of cementation 646-652 



Intrusive rocks, composition of, a factor in meta- 

 morphism 713-715 



ground water temperature as affected by 590-591 



Intrusive masses, sizeof 711-712 



Invilliers, E. V. d\ and Lesley, J. P., on Cornwall 



iron-ore mines _ 1198 



Iolite, alterations and alteration products of 291, 



373,386,402 



chemical and physical constants of 19S,291 



occurrence of 291 



A onic theory of solutions, change of view required 



by 67-68 



statement of 116-118 



Ions, definition of ... 66 



separation of acids, bases, and salts into 85 



Iron, amount of, dissolved from rocks in weather- 

 ing..' __ 517 



compounds of, oxidation of 172 



in earth's crust, amount of 



in earth's crust, percentage of 934 



occurrence and combinations of 



oxidation of, methods of 467-468 



oxygen consumed in 950-951 ,955 



precipitation of copper by . . 1101 



Iron and copper compounds, association of 1158-1166 



Page. 

 Iron-bearing carbonate family of rocks, deposits 



composing 823-843 



Iron-bearing minerals, deposition of _ . 627 



Iron-bearing rocks, photomicrographs of 836 



Iron bisulphide, reactions involving 1161,1162,1163 



Iron carbonate, formation of, modes of 233-234, 



239, 241, 242, S27, 843, 844, 1176 



oxidation of 467 



Iron compounds, decomposition of, in rock weath- 

 ering 517,536 



deoxidation of ._ 471-472 



Iron Mountain, Mo., process of weathering at 520-521 



Iron ores, bog deposits of, formation of 550 



conditions of occurrence of, figures showing . . . 1196 



formation of, by ascending solutions 1089 



by chemical precipitation 1037 



by reprecipitation and solution. ._ 541 



modes of 560-561, 1044^1045, 1061, 119:3-1198 



residual deposits of. 1039 



titanif erous, deposits of _ 1044-1045 



Iron oxides, ferric and ferrous, ratios of in sedi- 

 mentary and igneous rocks 950-951 



formation of.. 241-242, 282, 2S5,2S6, 322, 540 



forms of deposition of 623 



removed from soil annually, amount of 486 



source of 370 



surface induration of rocks by ___ 548-549 



Iron-oxide family of rocks, deposits forming 842-846 



Iron sulphate, production of 468 



Iron sulphides, oxidation of._ 468,952 



reactions involving... 952,1143,1149,1150,1161,1162,1163 



volume changes incident to production of 418-469 



Iron, zinc, and lead compounds, association 



of.... 1144-1158 



Irrigation, migration of alkalies to surface caused 



by 546 



Irving, A., on alterations of rocks by contact meta- 

 morphism 489-490 



on classification of matmorphism 39 



Irving, J. D., on tellurides associated with Potsdam 



gold ores of the Black Hills 1119 



Irving, R. D., on alterations of rocks by contact 



metamorphism 489-190 



on cementing materials of rocks, similarity of, 



to rock cemented _ 628 



on copper (native) and magnetite, association 



of. nas 



on copper deposits of Keweenaw Point, Mich.. 1087 



on metasometism in the Keweenawan series 641 



on ore deposits of the Penokee-Gogebic district 



of Michigan and Wisconsin 1216 



on production of openings at contact of igneous 



and intruded rocks...-. 655 



Irving, JR. D-, and Van Hise, C. R., on actinolite, 



growth or penetration of, into quartz 219 



on alteration of clastic rocks. 184 



on enlargement of mineral particles. 644, 874 



on diabase from Michigan, losses in, cme to 



weathering 511 



on iron-ore deposits, origin of 831 



on iron silicate rocks, agency of igneous intru- 

 sions in producing 840 



on recementation of rocks 564 



on recrystallisation of quartz and development 



of mica in rocks 694 



on rock textures (original), preservation of, 



after metasomatic alteration _ 644 



on schists of the Lake Superior region 904 



