GENERAL INDEX. 



Precipitation of clay suspended in 

 water, Mr. W. Ramsay on the 

 influence of various substances in 

 accelerating the, 129. 



Prodiicfus, Mr. R. Etheridge, jun., on 

 an auherent form of, and a small 

 Spiriferina from the Lower Carbo- 

 niferous Limestone group of the 

 east of Scotland, 454. 



Productus complectens, 462. 



Prudelle, Plateau de la, curvitabular 

 structure in the, 146. 



Pulpit Rock, section of Giant's Kettle 

 in Laurentian granite in the, 78. 



Quartz, 413. 



Quartz-andesites of Schemnitz, analy- 

 sis of, 303. 



Quartz-felsite of St. John's vale, 12, 

 18, 22 ; of Crag Bridge, 14, 18. 



Quartz-trachytes of Schemnitz, analy- 

 sis of, 303. 



Quartzite, implements of, from the 

 Robin-Hood Cave, Creswell Crags, 

 250. 



Rae Crags, spherulitic felsite of, 20. 



Ramsay, Prof. A. C, how Anglesey 

 became an island, 116. 



, note to Mr. W. Ramsay's 



paper on the influence of various 

 substances in accelerating the pre- 

 cipitation of clay suspended in 

 water, 132. 



, on the phvsical history of the 



Bee, Wales, 219. 



Ramsay, William, Esq., on the in- 

 fluence of various substances in 

 accelerating the precipitation of 

 clay suspended in water, with a 

 note by Prof. Ramsay, 129. 



Reindeer, occurrence of, in the Robin- 

 Hood Cave, Creswell Crags, 247, 

 249. 



Reptile, Prof. Owen on a carnivorous, 

 95. 



Rhastic beds, Mr. Harrison on the oc- 

 currence of, in Leicestershire, 212. 



, section of, Spinney Hills, 



near Leicester, 213. 



Rhinoceros tichorhinus in the Robin- 

 Hood Cave, Creswell Crags, 247, 

 249. 



Bhoechinus irregularis, 37. 



Rhopalodon Wangenheimii, 355. 



Rhyolites, Hungarian, 299. 



of Schemnitz, analysis of, 303. 



River action, Proc. 4. 



— Lemon, section from near 



Newton Abbot to Milber Down 

 through, 230. 



Robin-Hood Cave, Mr. Boyd Daw- 

 kins on the Mammalia and traces 

 of man found in the, 245. 



, sections in the, 242, 243. 



Roche Sanadoire, columnar and fissile 

 structures in the, 143. 



Tuilliere, columns and cross 



joints in, 144. 



Rosehill, Castle Horneck, crystalline 

 slaty rock from, 166. 



Rosemorran, Gulval, crystalline slaty 

 rock from, 166. 



Rougeac, section at, 147. 



Round Dale, hypersthenite of, 17. 



Knott, diorite of, 16, 21. 



Rowley - Regis basalt, complicated 

 spheroidal structure in, 151. 



Royat, columns in lava at, 148. 



Rudna valley, section from the Eisen- 

 bach valley to the Hodritsch valley 

 through the, 319. 



Rybnik, hornblende-andesite of, analy- 

 sis of, 308. 



St. Austell, altered dolerite from, 422. 



St. Erth and Camborne, rocks of the 

 district between, 172. 



St. Ives district, rocks of, 172. 



St. John's vale, quartz-felsite of, 12, 

 18. 



St. Michael's Mount, altered slates 

 from, 411. 



St. Stephens, elvan near, 175 ; analy- 

 sis of, 176. 



Salcombe Hill, section from Sidmouth 

 to Beer Head through, 276. 



Sanadoire, Roche, columnar and fis- 

 sile structures in the, 143. 



Sandstone, flowerpot-shaped blocks of, 

 at Theresa, Jefferson County, New 

 York, 78. 



Schemnitz district, geological struc- 

 ture of the, 294. 



, Mr. Judd on the ancient vol- 

 cano of the district of, 292. 



Schist, mica-, 409. 



, spotted, of the Lake- district, 2, 



4,5. 



, tourmaline-, 408. 



Schuttrisberg, aplite forming a vein 

 in gneiss at, 320. 



, section through the Kohl Berg, 



passing through, 318. 



Schwatzer Berg, section through the, 

 319. 



Scorpion, Mr. H. Woodward on the 

 discovery of a fossil, in the British 

 Coal-measures, 57. 



Scotland, Mr. H. Woodward on a re- 

 markable fossil Orthopterous insect 

 from the Coal-measures of, 60. 



