INDEX. 



1269 



Page. 



Merrill, G. P., on acids in soils _ 462 



on bacteria, increased activity of, in tropical 



countries 466 



on burrowing animals, effect of work of, on 



soils ..: 449,450 



on carbon dioxide in rain water, as determined 



by Fischer 474 



on carbon dioxide in soils, as determined by 



Boussinganlt and Leroy 474 



on casehardening of rocks 549 



on diatom deposit of chert at Richmond, Va 818 



on disintegration of rocks, depth of 530 



by changes in temperature 439 



on removal of pressure 104 



on freezing as an agency in removing disinte- 



grated-rock material. __ 443 



on hydration of granite rocks. __ 481 



on man's work on soil _ _ 451 



on nitrate deposits of Chile 543 



on pore space in chalk *.. 125 



on preservation of original textures and struc- 

 tures in decomposed rocks 525-526 



on pressure as affecting character of rocks 363 



on solubility of silica _ 516 



on soluble material in soils, proportion of to de- 

 gree of comminution 495 



on uplift of overlying material by a hydrating 



rock 171 



on trituration of rocks, limit of 432 



on vegetation, effect of on motions of ground 



water 422 



on weathering, end products of 521 



on weathering, losses of constituents of rock 



by 507,522-523 



Mesolite, alterations and alteration products of.. 333-334, 



373,387,401 



chemical and physical constants of 199,329 



occurrence of ._ _ 332 



sources and modes of formation of . _ _ 262, 



&32, 371, 375, 377,398 



Meta, definition of term.. 776 



Metals, occurrence of forms of 172 



precipitation of, methods of 10S1-1088 



solution of 1073-1075 



sources of 1030-1036,1069-1072 



transportation of __ ._ 1075-1081 



Metamorphic action of intruded magmas, discus- 

 sion of 648 



Metamorphic ore deposits, enumeration of 1. 1233 



Metamorphic processes, ores produced by 1052-1232 



Metaniorphie textures of rocks, plate showing 704 



Metamorphism, agents of 33, 34-35, 39-40, 44, 58-158 



belts and zones of, definitions of _ 159, 



160,163,164,167,189-190 

 chemical elements, distribution of, as affected 



by _ 932-1003 



classification of 39-40 



contact, direct contact effect of 489-190 



discussion of _ 488-494 



exomorphic and endomorphic effects of 488 



indirect contact effect of 490-494 



definition of 33 



extent of, by igneous intrusion in belt of cemen- 

 tation __ 649-652 



factors affecting _ __ _ 40-44 



forcesof... 39-40,44,45-57 



general principles of 32-38 



Page. 



Metamorphism, geological factors affecting ._ 40 



n belt of cementation _ 562-656 



n belt of weathering 409-561 



n zone of anamorphism 657-774 



n zone of katamorphism 409-656 



ores produced by 1052-1232 



rateof.. __ 36 



relations of ore deposit to 1004-1243 



relations of stratigraphy to 907 



relations of, to distribution of the chemical ele- 

 ments.. 932-1003 



structures and textures produced by 37-38 



variations in, within one district 917-921 



variations in nature of , withdepth.. 160 



zones of, definitions of 159, 160, 163, 164, 167, 189-190 



Metamorphism by igneous intrusion, conditions 



governing extent of 649-652 



See also Alteration. 



Metasomatism, conditions favorable to 641-642 



definition of _, 631,640 



extent of _ 640-641 



growth of large mineral individuals by, with 



preservation of original textures.. 643-645 



in zone of anamorphism, methods of 



minerals formed in __ 



minerals produced by 642-643 



operation of, in conjunction with cementation . 654 



segregation of individual minerals by... _ 645-646 



volume change by, illustration of 632 



Meteorites, constituents of 945-947,970,975,978 



Metia, island of, magnesian coral reefs at 799, 803, 804 



Mexico, copper and copper-gold deposits in 1056 



Micas, character, occurrence, and alterations of . 336-344 



sources and modes of formation of 228, 256, 



326, .337, 338, 339-344, 371, 374, 

 380, 383, 392, 393, 394, 625-627 



authigenic nature of _ 693-694 



percentages of, in igneous rocks 937 



Michigan, diabase from, losses in, by weathering. 510-511 

 Microcline, alterations and alteration products 



of-... 253-257,373,389,398 



chemical and physical constants of 199.253 



occurrence of 253 



sources and modes of formation of. 253, 281, 371, 392, 397 

 Microcline, albite, and anorthite, alterations and 



alteration products of 389 



Microcline and gibbsite, alterations and alteration 



products of _. _ 389,400 



Microcline and orthoclase, equation showing pro- 

 duction of muscovite from 1070 



Microcline, calcite, and hematite, alterations and 



alteration products of _ 389, 401 



Microcline, magnesite, and siderite, alterations and 



alteration products of _ 389, 401 



Microcline, magnesite, siderite, and gibbsite, altera- 

 tions and alteration products of . . . 389, 401 



Miller, W. G., on corundum deposits 223 



on corundum-syenite _ ._ 1045 



Mineral composition of earth's crust, discussion 



of- - 192-201 



Mineral composition of rocks, effect of, on rate of 



weathering _ ._ 533 



use of, as criterion for discriminating metamor- 

 phosed, sedimentary, and igneous 



rocks 915-917 



Mineral growth in rocks, examples of.. _ 643-645 



methods of _. _ _ 619-631 



