INDEX. 
263 
Petrology (general)— Continued. 
Opnitic texture: Lane, 1514. 
Quartzite, classification and origin : 
Cayeux, 448. 
Petrographic nomenclature : Hobbs, 
1177. 
Petrography, relations to other 
sciences : Zirkel, 2665. 
Rieheckite rocks, origin : Murgoci, 
177S. 
Rock minerals, determination of: Id- 
dings, 1266. 
Rocks for rock-building: Lord, 3616. 
treatise on : Merrill, 1732. 
Schistosity by crystallization : Wright, 
2648. 
Serpentine, alteration of: Knopf, 1416. 
Silica, determination of: Knight, 1413. 
Texture of igneous rocks: Cross et "/.. 
608. 
Tridymite, production of, in volcanic 
rocks : Lacroix, 1453. 
Philosophy. See History. 
Phosphate. 
Arkansas, northern : Purdue, 1968, 
1970. 
Florida : .lumeau, 1344. 
Idaho : Jones, 1317 ; Weeks and Fer- 
rier, 2.107. 
Mexico, Zacatecas : Burckhardt, 361. 
South Carolina: Sloan, 2218. 
Tennessee : Johnson, 1309 ; Ruhm, 
21(H). 
United States: 2418, 2419. 
I'tah : Jones, 1317; Weeks and Fer- 
rier, 2507. 
Wyoming : Jones, 1317 ; Weeks and 
Ferrier, 2507. 
Phosphorus. 
Pennsylvania. Mount Holly Springs : 
Stose, 2321. 
United States: 2419. 
Physiographic (general). For regional see under 
the various states. See also 
Drainage changes. 
Aggradation and degradation of val- 
leys : Moody, 1767. 
Alluvial cone topography : Purdue, 
inc.",. 
Alluvial sloi.es : Siehenthal, 2206. 
Appalachians: Machacek, 1665. 
southern : Keith, 1355. 
Bolsoa plains, origin : I'dden, 2409. 
Coastal plains : I >avis, 673. 
Cordillera, North American, nomen- 
clature of: Daly. 634. 
Delta, of Mississippi: Ililgard, 1146; 
Mcl'.eth. 1638. 
of Rio Colorado: Macdougal, 1661. 
Experimental physiography : Hubbard, 
1252. 
Ploodplalns without floods: Fenne- 
man, 858. 
Geographical cycle in an arid climate: 
Davis, 665. 
Physiographic (general)— Continued. 
Gorges of Finger Lake region : Tarr, 
2M48. 
Hanging valleys : Davis, 678. 
Meandering of Buffalo River : Griggs, 
1043. 
Mountains, study of : Davis, 676. 
Physical factor in general geography : 
Davis, 672. 
Physiographic descriptions, technique 
of : Davis, 675. 
Physiographic problems of to-day : 
Russell, 2102. 
Physiography, relations to other sci- 
ences : Penck, 1889. 
Potomac River, geographic history of: 
Willis. 2592. 
Rivers, types of: Dappert, 641. 
Rocky Mountain region : Evans, 828. 
Scarps: Davis, 681. 
Scaurs on the River Rouge : Jefferson, 
1286. 
Sculpture of mountains by glaciers : 
Davis, 668. 
Seismotectonic lines : Hobbs, 1191. 
Sink-hole lakes : Sellards, 2165. 
Terraces of the West River : Fisher, 
875. 
Text-books : Fairbanks, 832 ; Salisbury, 
I'll 7. 
Valleys, incised meandering: Davis, 
669. 
Wolds and vales of belted coastal 
plains : Davis, 679. 
Pisces. 
Amyzon brevipinne Cope : Lambe, 1491. 
Arthrodira : Hussakof, 1258. 
Arthrodires, Dipnoan affinities of : 
Dean, 698 ; Eastman, 756. 
California: Jordan, 1324. 
Cestraciont teeth from the Jurassic : 
Wemple, 2526. 
Devonian fishes, Canada : Whiteaves, 
2559. 
New York : Eastman, 760. 
Marine Triassic from Aspen Ridge, 
t Idaho : Goddard, 972. 
Mylostoma : Eastman, 7T»7. 
Mylostomid dentition : Eastman 758. 
Phlyctaenacanthus telleri : Teller, 2:566. 
Portheus molossus from the Kansas 
chalk: Sternberg. 2284. 
Ptyctodus from Kinderhook of Mis- 
souri : Weller, 2519. 
Salem limestone of Indiana : Branson, 
290. 
Shark related to Edestus : Hay, 1105. 
Silurian lis!. : Matthew. L696. 
Stickleback ftsh from Nevada: Hay, 
1104. 
Surgeon-fish from the West Indies: 
Hussakof. 1259. 
Placers: Hutchins, 1261, 1262. 
Plants. See Paleobotany. 
Platinum. 
California : Aubury, 87. 
