----, ----, geology of the country near, and list of minerals, _J. Finch_, viii, 236.^f ----, geological survey of, proposed, xii, 173. ----, ---- report of _H. D. Rogers_, noticed, xxxii, 192; xxxiv, 188; xxxvii, 380; xli, 385. ----, internal improvements in, xxv, 84; xxvi, 108. ----, iron furnace at Mauch Chunk, xii, 61. ----, iron ores of Center and Huntingdon Cos., xii, 73; --mode of manufacturing, 74. ----, ---- ---- of Belmont coal mines, xii, 302. ----, ---- ----, analysis of, _W. R. Johnson_, xxxviii, 383; xxxix, 142. ----, Lackawanna region and coal, _J. Pierce_, xii, 67. ----, ---- ibid, Belmont, _T. Ritter_, xii, 301. ----, Laurel Mountains, xxi, 346. ----, Lehigh coal and navigation company, xxiv, 173. ----, Lehigh coal, analysis of, xl, 373. ----, Lehigh river, character of, _J. Pierce_, xii, 59. ----, Mauch Chunk and vicinity, xii, 56, 60. ----, ---- ----, _B. Silliman_, xix, 7;--canal, 7, 8; scenery, 8; railroad, 9, 16; cost of main railway, 11; mines, &c., 11; public house, 16. ----, mineral resources of, _J. Pierce_, xii, 54. ----, Monongahela valley, rocks and coal, xxix, 58, 60^f, 63.^f ----, Fort Pitt remains, _W. B. Weed_, xxi, 197. ----, Pittsburgh coal strata, xxix, 68.^f ----, ----, amount of coal consumed at, xxix, 79. ----, ----, manufactures of, xxix, 79. ----, Pottsville or Mount Carbon, _J. Pierce_, xii, 63, 65. ----, ----, descent from, to Philadelphia, xii, 64. ----, ----, Carbondale, xviii, 313, 319, 324. ----, salt wells of Conemaugh and Kiskiminitas, xxix, 72, 74. ----, ---- ---- ----, coal consumed in the manufacture, xxix, 79. ----, ---- springs of Conemaugh and Kiskiminitas, and manufacture, xii, 70. ----, ---- ---- near Pittsburgh, xii, 72. ----, ---- ---- in Mercer Co., xii, 72. ----, scenery from Harrisburg, westward, _W. B. Weed_, xxi, 197. ----, Schuylkill, passage of, and of canal, through the Blue Ridge, _J. Pierce_, xii, 64; navigation of, 65. ----, soil of the counties near Ohio, xii, 73. ----, trap dikes in, _H. D. Rogers_, xli, 173. ----, Westmoreland Co., footprints in, _A. T. King_, xlviii, 217, 343^f; xlix, 216.^f ----, Wyoming region and coal beds, iv, 1^f; vii, 260. ----, ---- ---- ----, _J. Pierce_, xii, 66. ----, ---- ---- ----, _B. Silliman_, xviii, 309^f; --disputed title, 315; scenery and surface, 316; people, forts, battle ground, 317. Pentremites, see ZOOLOGY, _Radiata_. Pepper, analysis of, iv, 390. _Pepys, W. H._, electro-magnetic apparatus, vii, 195. Perca nobilis, dissection of the eye of, xxvii, 216.^f Perchloric ether, xlii, 63.