INDEX. Pr-St 



543 



Primary crinoids, 486. 



foramiuifera, 479. 



rocks, palaeontological breaks in, 



340. 

 sea-urchins, 489. 



sponges, 477. 

 Principle of stratification, 68. 

 Procoelia, 514. 



Productiveness of mineral veins, 411. 



Proportions of sands, clays, and. lime- 

 stones, 89. 



Propylite, 255. 



Protocardium, figure of, 497. 



Protogine, 36, 216. 



Provinces of land life, 461. 



of marine life, 457. 



Psammolithic group, 54. 



Pterodactylia, 518. 



Pterosauria, 518. 



Pterygotus, restored by Dr. Woodward, 

 493. 



Pumice-stone, 37. 



Purbeck, elevation of Isle of, 329. 

 mammalia, R. Owen on, 521. 



Puy de la Piquette, 28. 



Pyramid Lake, trachyte of, 266. 



Pyrenees, metamorphic rocks of, 392. 



Pyrites, diffusion of, 410. 



Pyroxene in polarised light, 253. 



Pythonomorpha, 511. 



QUARTZ, 21. 



augite andesite, 275. 

 -T diorite, 226. 



dolerite, 39. 



felsite of Corriegills, 305. 



orthoclase rocks, 36. 



in polarised light, 252. 



in rhyolite, 271. 



plagioclase rocks, 39. 



porphyry, 37. 



propylite, 39, 257. 



rock, 376. 



of Anglesea, 381. 



in Scotland, 388. 



trachyte of Steve's Ridge, 267. 



Quartzite of the Central Highlands, 384. 

 Quenastite, 39. 



RAIN channels, 147. 



Raised sea-beaches, 327. 



Rake veins, 403. 



Ramazzini, 6. 



Ramsay (Sir A.), on Arran, 240. 



on cleavage, 32. 



on the granite of Anglesea, 234. 



on Holyhead, 381. 



on pisolitic iron, 51. 



on Welsh volcanoes, 294. 



Rate of flow of lava, 186. 

 Ray, 6. 



Reconstructed deposits, 52. 

 Red clay in the deep sea, 183. 



of the Atlantic, 100. 

 Red rain, 18. 

 Redruth, tin lode at, 420. 

 Red Sea, coral reefs in, 115, 



Reduced pressure iuvolved in liquefac- 

 tion, 177. 



Relation of hot springs to mineral veins, 

 198. 



of living to fossil faunae, 460. 



of metals to rocks, 410. 



of plutonic and volcanic rocks, 209. 



Reptiles, fossil, 511. 



Reusch on fossil-bearing schists, 394. 



Reusch and Brogger ou giants' kettles, 

 154. 



Reykiadal, 194. 



Rhabdoliths, 106. 



Rhone, 161. 



Rhynchocephalia, 512. 



Rhynchonella, figure of, 496. 



Rhyolite, 37. 



of Mont Dore compared with sand- 

 stone, 211. 



of Fairy Crag, 236. 



of Mount Richthofen, 273. 



Von Richthofen on, 269. 



Rib of ore, 401. 



Richer, 13. 



Richthofen on fissure eruptions, 189. 



on hypothesis of five magmas, 170. 



on propylite, 255. 



on Tertiary lavas, 200. 



Rider, 401. 



Riesengebirge, metamorphic rocks of, 

 394. 



Rimbombo, 181. 



Ripple drift in mica schist, 375. 



Riviera, serpentines of, 289. 



Rivers without lakes, 156, 161. 



Roches moutonnees, 149. 



Rocks formed of coral, 113. 



Rock-salt, 21. 



Rocks, unstratified, 69. 



Rogers on earthquakes, 322. 



Rolled masses in mineral veins, 403. 



Roman bathg, 29. 



Roscoe on spectrum analysis, 16. 



Rosen au, 259. 



Rosenbusch, 38. 



petrological microscope, 253. 



on volcanic rocks, 255, 260, 264, 



268, 285. 



Rotation of the earth, 12. 



Roth, Justus, on felsite porphyry, 270. 



Rowley Hills, 303. 



Ruabon coal-field, iron of the, 431. 



Rugosa, 481. 



Rurn, volcano of, 319. 



Ruminants, Gaudry on evolution of, 522. 



Russia, granite in, 220. 



Rutile, artificial formation of, 420. 



Rutley, 22. 



on Brent Tor, 302. 



on Skomer Island, 297. 



on the Glyders, 296. 



on volcanic rocks near Bristol, 302. 



Rydal, green slates of, 101. 



SABINE, General, on Amazon mud, 165. 



St. Agnes, tin of, 421. 



St. Andrews, volcanoes of, 339. 



