INDEX. 



1271 



Packard, R. L., on occurrence of nickel as a silicate. 1131 

 Paragonite, chemical and physical constants of . . . 199, 



336,338 



occurrence and alterations of 338 



sources and modes of formation of 258, 



260, 261, 337,338, 371, 375, 377, 388-, 400, 401,408 

 Parankerite, alterations and alteration products 



of 242-243,374,376,405,406 



chemical and physical constants of 199, 237 



occurrence of 242 



sources and modes of formation of 242, 823-829 



Parankerite and ankerite, alterations and altera- 

 tion productsof 376 



Parankerite and quartz, alterations, and alteration 



productsof 376,407 



Parankerite, ankerite, and quartz, alterations and 



alteration products of 376 



Park Ranges, uplift of, discussion of . . 929-930 



Parker, E. W., on amount of coal mined and used . . 464 



Pectolite, chemical and physical constants of 199,271 



occurrence of _ 273 



source and mode of formation of . . . . 273, 



280,333,334,371,378,401 

 Peale, A. C, on carbonates in waters of mineral 



springs 611 



on chemical action taking place in solutions G8 



on ferrous iron in sulphate-bearing mineral 



waters 1093 



on silica in spring water ___ ._ 572,867 



Pearlash. See Potassium carbonate. 



Peat beds, production of _ 472 



Pebble, gravel, and bowlder deposits, discussion of. 853-S69 

 Pebbles, quartz, simulation of, by sheared quartz 



fragments 911 



Pecos Valley, New Mexico, prevention of alkaline 



deposits in, methods adopted for 546 



Pegmatite veins, possible relation of to ore deposits. 1050 

 Pegmatites, production of, by contact metamorph- 



ism 720-728 



Peirce, on greater tidal forces of the past 931 



Pelite-gneiss, deposits of, origin and character of. 894-904 



Pelite order of rocks, families of 785 



deposits composing 886-892 



Pelite-schist, deposits of, origin and character of. 894-904 

 Pelite-slate, deposits of, origin and character of.. 894-904 



Pelites, definition of.. __. 785 



photomicrographs of . 902 



Penck, A., on limitation of heights of mountains by 



disintegration 499 



Penfield, S. L., and Sperry, F. L., cited on aphro- 



siderite at Spun* mine 303, 305 



Penninite, formation, alterations and alteration 



productsof 347-348 



chemical and physical constants of 196,344,345,346 



occurrence of 346-347 



sources and modes of formation of 343,344,371,390 



Penokee-Gogebic district, diabase from, losses in, 



by weathering _ 510-511 



photomicrographs of rocks from 836 



Penokee series of Michigan, diabase dikes in, meta- 



morphism of 42 



Penrose, R. A. F., jr., on copper deposits of Arizona. 1184 

 on difference in effects of displacement on differ- 

 ent kinds of rock 1010 



on ore deposits, Cripple Creek district . . 1085, 1169, 1205 

 on ore deposits, superficial alteration of 1190 



Page. 



Penrose, R. A. F., jr., on ore shoots in fissures 1223 



on manganese silicate 1131 



on phosphates, origin of 976 



on sulphates, formation of _ _ 1141 



on telluride gold ores of Cripple Creek, Colo 1119 



on tellurides and fluorite, association of 1122, 1123 



on tellurides and sulphides, association of 1120 



on tin deposits of Malay Peninsula 1039,1054-1055 



on veins of Cripple Creek district _ 1202 



Peridot, chemical and physical constants of 199 



Peridotites, ore deposits in 1047 



Perovskite, alterations and alteration products of. 355, 



374,389 



chemical and physical constants of 199,354 



occurrence of 355 



source and mode of formation of 355,371,393,401 



Perry, J. H., on occurrence of graphite 212 



Phillipsite, chemical and physical constants of ... 199,330 



sources and modes of formation of 262, 



332,371,375,376,386,397 

 Phipson, T. L., on carbon dioxide nowand formerly 



in atmosphere 949,950,956 



on oxidation of hydrogen by plants 953 



Phlogopite, alterations and alteration products 



of 343-344, 374, 389, 390, 397, 403 



chemical and physical constants of 199,336 



occurrence and associations of 343 



Phlogopite-chlorite, chemical and physical con- 

 stants of ._ 199 



source and mode of formation of 371 



Phonolite, losses in, by weathering, analyses show- 

 ing. 512 



Phosphates, character, occurrence, formation, and 



alterations of 356, 542-543, 976-977 



Phosphation, definition of. __ 206 



Phosphoric acid, percentage of, in grain and straw. 454 



presence of, in ground waters 93 



Phosphorus, in earth's crust.. __ 936,975 



in meteorites 975 



in original and ssdimentary rocks 975-976 



Phosphorus pentoxide, percentage of, in earth's 



crust -- 937,938 



Physical and chemical principles applicable to ac- 

 tion of ground water.... ._ 65-123 



Physical-chemical factors affecting rock alter- 

 ation 359-365 



Physical revolutions, effect of, on ore depos- 

 its { 1221-1222 



Physics, principles of, applicable to motions of 



groundwater __- 65-123 



Pickering, S. P. U., on precipitation of basic ferric 



sulphate. 826 



Picotite, chemical and physical constants of 200 



Piedmontite, character, occurrence, formation, and 



alterations of 320,321-322 



Finite, chemical and physical constants of 200 



source and mode of formation of 291, 



293,312,371,386,397 



Pirsson, L. V., and Weed, W. H., on tellurides asso- 

 ciated with gold ores of Judith and 

 Little Rocky mountains, Mont_ 1119 



Pirsson, L. V., Cross, "Whitman, Iddings, J. P., and 

 Washington, H. S., on mineral com- 

 position of amphibole gabbro 632 



Pitching arches, influence of, on ore deposition. 1211-1216 



Pitching troughs, influence of, on ore deposition. 1211-1216 

 origin of.. 1215-1216 



