INDEX. 



1275 



Tage. 

 Preston, Thomas, on pressures necessary to keep 

 water liquid at different tempera- 

 tures 568 



Prestwich, Joseph, on dolomitization of Carbonif- 

 erous limestones in Ireland 799-800 



on ground-water transmission as influenced by 



size of openings in rocks 154 



on retention of decomposed potassium feldspars 



by rocks 1001 



Prochlorite, chemical and physical constants of.. 196,346 



occurrence and alterations of . _ 346-348 



Przibram mining district, ground water in mines 



of - 1063, 1077 



Psammite order of rocks, deposits forming. . . 785, 860-886 



Psephite gneiss, origin and character of __. 857-860 



Psephites, deposits composing 785, 853-860 



Pseudo-conglomerates, discrimination of, from true 



conglomerates 910 



Pumpelly , Raphael, figure cited from 923 



on aphrosiderite at Spurr mine. 303 



on cementing materials, similarity of to rocks 



cemented 628 



on copper deposits of the Lake Superior re- 

 gion 1101,1204 



on hydroussilicatesintheLakeSuperiorregion. 1130 

 on metasomatism in the Keweenawan series ... 641 

 on replacement of silica by copper in rocks of 



Lake Superior region 77 



on substitution of copper for porphyry pebbles. 656 

 Pumpelly, Raphael, "Wolff, J. E., and Dale, T. 1ST., on 

 crystallographic orientation of por- 



phyritic feldspar 698 



Purington, C. W., Woods, T. H., and Doveton, G. D., 

 on occurrence of rhodonite at the 



Camp Bird mine, Colo 1115-1116 



Pyrite, alteration of , to magnetite 845,846,1112 



alterations and alteration products of 214-216, 



374,390,406 



association of gold deposits with 1095, 1096 



chemical and physical constants of 200,213 



occurrence of 213-214 



precipitation of copper sulphide from cupric 

 sulphate by, equation showing reac- 

 tion for 1116 



sources and modes of formation of . _ 213-216 



226, 227, 371, 384, 387, 390, 399, 408, 627, 1153 

 Pyrite and siderite, alterations and alteration 



products of 392,406 



Pyrope, alterations and alteration products of 302, 



374,376,390,397,399,401,402,404 



chemical and physical constants of _ 200,299 



occurrence of 301 



sources and modes of formation of _ 386 



Pyrope, almandite, and melanite, alterations and 



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

 Pyrope and almandite, alterations and alteration 



products of 375, 383, 390, 401, 404 



Pyrope, grossularite, and melanite, alterations and 



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

 Pyrophyllite, sources and modes of formation of .. 25'' 



254,371,389 

 Pyroxenes, alterations and alteration products of . 275- 



278,279 

 character, occurrence, formation, and altera- 

 tions of 267-281,380,383,394,822 



percentage of, in igneous rocks 937 



Pyroxenite, losses in, by weathering, analyses 



showing 510,515,522-523 



Pyrrhotite, alterations and alteration products 



of 21 4-216, 374, 390, 391, 406, 408, 849 



chemical and physical constants of 200, 213 



chemical reactions involving 846 1161 



occurrenceof 213-214 



sources and modes of formation of 213-214 



Q- 



Quadrupeds, burrowing, effect of work of, on soils. 450 

 Quarry water of sandstones, surface induration 



caused by evaporation of 549 



Quartz, alterations and alteration products of 218-220 



cementation by, preponderance of 634-636 



chemical and physical constants of 200, 217 



~ clastic, penetrated by serpentine, figure show- 

 ing- 643 



in igneous rocks, percentage of _ 937 



mobility of _ 755 



occurrence of ._ 217-218 



sources and modes of formation of 218, 220-221, 



254, 260, 261 , 264, 269, 273, 282, 285, 286, 304^ 

 , 305, 306, 307, 309, 312, 323, 339, 349, 353, 366, 

 371, 375, 376, 377, 378, 379, 380, 381, 383, 383, 

 384, 385, 387, 388, 389, 3E0, 391, 393, 394, 396, 

 398, 399, 400,401,403,404,405,540,622-623 



vein, figure showing 1155 



Quartz and analcite, alterations and alteration 



products of 376 407 



Quartz and ankerite, alterations and alteration 



products of _. _ 376,407 



Quartz and calcite, alterations and alteration 



productsof ._ 380,407 



Quartz and corundum, alterations and alteration 



productsof _ 381,406 



Quartz and diaspore, alterations and alteration 



productsof ._ 381,382,407 



Quartz and dolomite, alterations and alteration 



productsof 382,407 



Quartz and gehlenite, alterations and alteration 



productsof... 383,406 



Quartz and gibbsite, alterations and alteration 



productsof 383 407 



Quartz and hornblende, alterations and alteration 



productsof ..... 385,399,405 



Quartz and nephelite, alterations and alteration 



productsof. 388,406 



Quartz and olivine, alterations and alteration 



products of 388,406 



Quartz and parankerite, alterations and alteration 



products of 376,407 



Quartz and siderite, alterations and alteration 



productsof 392,407 



Quartz, ankerite, and parankerite, alterations and 



alteration products of 376 



Quartz, bronzite, and calcite, alterationsand altera- 

 tion products of 379,407 



Quartz, calcite, and corundum, alterations and al- 

 teration products of _ 381,408 



Quartz, calcite, and forsterite, alterations and al- 

 teration products of... _ 383,407 



Quartz, calcite, and hypersthene, alterations and 



alteration products of 379, 407 



Quartz, calcite, and ilmenite, alterations and altera- 

 tion products of 385,408 



Quartz, calcite, and olivine, alterations and altera- 

 tion products of 388, 407 



Quartz, calcite, and rutile, alterations and altera- 

 tion products of.. 391,407 



