542 



INDEX. Ow-Pr 



Owen, SirR., on ichtbyosaurs and pie- 

 siosaurs, 514. 



on local persistence of types, 452. 



on South African reptilia, 515. 



on tritylodon, 520. 



Oxfordshire irou ore, 432. 

 Oxland on silver in sinter, 397. 



PACHYDERMS, evolution of, 522. 

 Palarctic flora, 470. 



region, 461. 



Palseaster, figure of, 484. 

 Palsechinus, figure of, 489. 

 Palseontological laws, 445. 



work, method of, 465. 



Palaeontology, 437. 



Palaeosauria, 512. 



Palissy, 6. 



Palraieri, 3. 



Paludina, figure of, 441. 



Panamic province, 460. 



Parallel mountain chains, 353. 



Parker, W. K., on foraminifera, 480. 



on crocodilia, 513. 



Parys mine, 403. 



Patagonian province, 459. 



Pea grit, 48. 



Pebble beds indicate upheaval, 332. 



Pebbly river-beds, 165. 



Pecteii, figure and characters of, 440. 



Pegmatite, 217. 



Pelolithic group, 54. 



Peltochelyida), 513. 



Penig, 24. 



Peninsulas pointing south, 353. 



Pennant, 46. 



Pennyghent, vertical strata of, 76. 



Pentacrinus, figure of, 487. 



Pentland Hills, 299. 



Perennial springs, 152. 



Perforata, geological succession of, 482. 



Peridotite, 286. 



Perlite, 37. 



Permian sandstone, 96. 



volcanoes, 311. 



Persistent types of life, 450. 



Peruvian province, 459. 



Petit Puy de Dome, augite andesite of, 



275. 



Petroleum springs, 193. 

 Petrological microscope, 253. 

 Pharyngognathi, 505. 

 Phascolotherium, figure of, 521. 

 Phene on travertine at Hierapolis, 108. 

 Phillips, John, on Glen Tilt, 249. 



on hypothesis of upheaval, 330. 



on Salisbury Crag, 30. 



J. A., analyses of sandstones, 210. 



on bubbles in quartz, 229. 



on concretions in granite. 218. 



on Devonian volcanoes, 300. 



on elvans, 232. 



on granite of Cornwall, 229. 



on mineral history of sandstones, 



92. 



397. 



on mineral veins now forming, 



Phillips, J. A., on the Wolf Hock, 251. 



"W., 22. 



Plilogopite, 26. 

 Pholadomya, 498. 

 Phonolite, 39, 268. 



of the Wolf Rock, 251. 



Phosphatite, 21, 47, 103. 



origin of, 104. 



Phyllopods in primary rocks, 493. 

 Physical and palaeontological breaks, 

 340. 



history of tertiary strata, 466. 



Physiological origin of species, 438. 



Physostomi, 506. 



Pictet on palseontological laws, 445. 



traite de paleontologie, 506. 



Pietra di Sarto, 289. 

 Pipe veins, 403. 

 Pikrite, 286. 



at Little Knott, 237. 



of Scotland, 310. 



Pitch Lake of Trinidad, 193. 

 Pitchstone, 37. 

 Plagioclase, 22, 363. 



granite, 221. 



rocks (quartz free), 40. 



Planorbis, figure of, 441. 



Plant life, succession of, 473. 



Plants, distribution of, 468. 



Plas Newydd, Henslow on garnets at, 



338. 



Plaster-of-Paris, 46. 

 Plectognathi, 506. 

 Plesiosauria, 514. 



Plombieres, zeolites in brickwork, 29. 

 Plot, 6. 



Pl} r mouth limestone, 48. 

 P<> delta, 166. 



Pocillopora as a source of metals, 399. 

 Polacanthas, Rev. D. Fox on, 517. 

 Polarised light, colours of minerals in, 



252. 



Poly mastodon, Cope on, 520. 

 Polypterus, figure of, 503. 

 Porites, 107. 

 Porphyrite, 38, 310. 



of the Cheviots, 298. 



Portrush prismatic lava, 316. 

 Portsoy, serpentine of, 313, 389. 

 Portus Valesize, 161. 

 Postlethwaite on mines in the Lake dis- 

 trict, 419. 

 Potash mica, 26. 

 Potstone of Scotland, 389. 

 Potstones in chalk, 112. 

 Pre-Cambrian volcanoes, 291. 

 Prehnite, 28. 



Preserving power of the soil, 145. 

 Pressure in metamorphism, 357. 



involved in rock-construction, 173. 



Prestwichia, figure of, 493. 

 Prestwich on the Chesil Bank, 124. 



on denudation of the Thames basin, 



152. 



on relation of volcanoes to springs, 



191. 

 Prevost, Constant, on upheaval, 170. 



