1268 



INDEX. 



Page. 



Magnesium-bearing minerals, deposition of 627 



Magnetite, alterations and alteration products of.. " 229, 

 373,386,396,404,405 



chemical and physical constants of 198,228,842 



formation of, chemical reactions involved in _ - . 838, 

 845, 846, 1102, 1112, 1126, 1197 



occurrence and character of 229,623-624,1197-1198 



precipitation of silver by 1100-1101 



sources and modes of formation of . 214, 215, 216, 



226,227,229,242,244,245,268,269,274,286,303, 

 309, 336, 342, 371 , 376, 378, 379, 381, 384, 385, 387, 

 388, 390, 391, 392, 393, 399, 401, 404, 405, 406, 408, 

 468,623-624,838,845, 846,1112, 1126,1197-1198 

 Magnetite and rutile, alterations and alteration 



products of. — 391,405 



Magnetite, augite, and siderite, alterations and 



alteration products of 378,408 



Magnetite beach sands, utilization of . 1039 



Malachite, alteration of, to azurite, equation show- 

 ing.. 1159 



formation of, from tenorite 1159 



Malacon, chemical and physical constants of 198 



source and mode of formation of 315,371,394,402 



Malay Peninsula, tin deposits of 1054-1055 



Mallet, Robert, on liquefaction of rocks by mechan- 

 ical action 99 



on source of molten matter of volcanoes 729 



Mammoth Hot Springs, sources of water of 1068 



.Man, effect of work of, on soils. 450-451 



influence of work of, on ground- water level . . 427-428 



Manganese in earth's crust _ 936-989 



occurrence and combinations of 989-990 



Manganese minerals, occurrence of 1116 



Manganese ores, genesis of 1037, 1198-1199 



Manganese oxide in earth's crust 938 



Manganese silicate, occurrence of 1131 



Manganese sulphide, importanceof , in precipitation 



of ores. 1116 



Marcano, V. , on amount of nitrates in soils of tropical 



countries 4f 15-466 



Marble, deformation of 658-659, 811-816 



deformation of, photomicrographs showing ef- 

 fects of 814 



formation of 808 



Marbles, actinolitic, origin of 833 



cherty, features and origin of 816,820 



grimeritic, origin of 833 



schistose, occurrence of. _ 810-811 



silicated, origin of 820-821 



Marcasite, alterations and alteration products 



of... 214-216,373,387,399,406 



chemical and physical constants of .... 198,213 



occurrence of _. T 213-214 



precipitation of copper sulphide from cnpric 



sulphate by 1116 



source and modes of formation of .,... ._ 213, 



214, 215, 226, 227, 371, 384, 408, 627, 1153 

 Marcasite and siderite, alterations and alteration 



products of 392,406 



Marcano, A., and Miintz, V., on origin of nitrates of 



Chile 543 



Margarite, alterations and alteration product of . . . 345, 



373,387 



chemical and physical constants of 198,344 



occurrence of 344 



sources and modes of formation of 223, 



224, 225. 232, 2:36, 371 , 381, 382, 383, 407, 408 



Page. 

 Marialite, alterations and alteration products of. 312-314, 



373,387,403 



chemical and physical constants of. 198,311 



occurrence of 312 



sources and modes of formation of. 263, 265, 312, 375, 400 

 Marmorosis, an example of alteration of rocks with- 

 out change in chemical composition. 202 



Marsh, G. P., on effects of man's work on soil.. 451 



Martite, formation of _ 467 



Maryland, argillite from, losses in by weathering.. 510, 



522 



Mashing of rocks, discussion of _ _ 762-764 



Mass mechanical action, definition of 47 



metamorphism by 49-50,685-698 



Mass-static conditions, alterations of rocks un- 

 der 698-706 



Massachusetts, diabase from, losses in, by weather- 

 ing 509,522 



Means, T. H., on saline incrustation of soils 544 



Means, T. H., and Gardner, F. D., on effect of alka- 

 lies in soils 478, 543 



Means, T. H., and "Whitney, Milton, on endurance 



of plants to alkalies 478 



Mechanical action in rocks, ground-water circula- 

 tion as affected by 149 



heat generated by 54 



metamorphic effect of 46-50,95-104 



relation of, to chemical action and heat 110-113 



Mechanical concentration, formation of ores by. 1038-1039 

 Mechanical effects of heat and light on rocks, state- 

 ment of. 55-56 



Mechanical work in belt of cementation, discussion 



of 594-602 



Mechanical work in metamorphism, combinations 

 and relations of, to chemical and 



igneous work 495-496, 653-655 



Meionite, alterations and alteration products of 373, 



387,397,406 



chemical and physical constants of 198,311 



of. 



312 



source and mode of formation of.. 263, 



265, 302, 303, 312, 371, 377, 384, 396, 400 

 Meionite and hematite, alterations and alteration 



products of 387,402 



Melanite, chemical and physical constants of 199, 299 



occurrence of 302 



Melanite, almandite, and pyrope, alterations and 



alteration products of„ 375,383,387,390,396 

 Melanite and grossularite, alterations and altera- 

 tion products of __ 383,384,387,390,398 



Melanite, grossularite, and pyrope, alterations and 



alteration products of. . 383, 384, 387, 390, 398 



Melilite, chemical and physical constants of 199 



sources and mode of formation of 314 



Mendeleeff, D., on carbon dioxide in the atmos- 

 phere 944,962 



on dehydration of silicic acid 617 



on soil's absorptive power for potassium 1001 



on solution of calcium carbonate by carbonic 



acid 794 



on solutions 74 



Meniscus, retarding influence of, in capillary flow. 141 

 Menominee district of Michigan, iron- ore deposit of, 



as affected by topography 1219 



Mercur mining district of Utah, ore deposits 



in 1208,1213 



Merrill, F. J. H., on Hudson schists 904 



