INDEX 
489 
i. 368, 385, 397, 400, 404, 408, 416, 430, I 
447 
Reyer, Prof. E., ii. 474 
Reynolds, Mr. S. H., i. 177, 179, 256 
Rhobel Fawr, i. 177, 178, 186 
Rhyolite, i. 19, 22, 24, 131, 161, 165, 167, 168, 
178, 204, 210, 231, 232, 255, 276, 278 ; ii. 
185, 205, 371, 424, 437 
Rhyolitic conglomerate, ii. 195, 206, 429 
Richardson, Rev. W., ii. 110 
Richthofen, F. von, i. 28 ; ii. 115, 116 
Rivers made to shift their channels by volcanic 
eruptions, i. 42, 49 ; of the Tertiary volcanic 
period, ii. 217, 228, 231, 234, 456 
Rocks, oldest known, i. 110 
Roscommon, volcanic rocks of, i. 316 
Rosenhuseh, Prof. H., ii. 136, 137 
Ross, Mr. Alexander, ii. 406, 409 
Rothliegcnde, ii. 95 
Roxburghshire, Carboniferous vents of, i. 55, 
403, 404 ' 
Rubers Law, i. 375, 380, 404 
Rum, i. 112 ; basalt-plateau of, ii. 215 ; gabbros 
of, 332, 349 ; acid bosses of, 403 ; acid sills 
of, 431 ; pitehstone of, 445 
Rutley, Mr. F., i. 131, 133, 170, 207, 210, 227, 
231, 232, 238, 260 ; ii. 23, 35 
Sahlite found in volcanic vents, i. 62 
Saline Hill, volcanic vents of, i. 433, 435, 440 
Sanday, basalts of, ii. 215 ; conglomerates of, 
226 
Sandstone altered into quartzite, i. 72, 349, 
350, 404, 432, 451 ; ii. 76, 164 ; veiniugs of, 
in lava, i. 283, 300, 303, 320, 327, 333, 337 ; 
ii. 59, 98 
Sandwich Islands, lava-cones of, i. 10 
Sanidine ejected from volcanic vents, ii. 58, 79 
Sanquhar, Silurian volcanic rocks at, i. 192, 
195, 199 ; Permian volcanic rocks at, ii. 62 
Santorin, ii. 134 
Saponite, ii. 79 
Scenery, origin of, i. 8, 100 
Schalstein, i. 262 ; ii. 36 
Schists, primeval, i. 110, 114, 118, 119 ; pro- 
duced by deformation of igneous rocks, 75, 
114, 118, 119, 121, 162, 240, 249, 252, 261 
Schmidt, Dr. C. V., ii. 266 
Scoriaceous structure, i. 15, 16, 282, 327, 339 
Scorpions, fossil, i. 174, 356, 466 
Scotland, lines of fault in, i. 11 ; Vesuvian 
cones of, 42 ; plateaux of, 43 ; puys of, 46 ; 
submarine lavas of, 48 ; Carboniferous vents 
of, 55 ; volcanic scenery of, 104 ; pre-Cam- 
brian rocks of, 111 ; Cambrian rocks of, 112; 
Lewiaian gneiss of, 114 ; Dalradian rocks of, 
121 ; Arenig rocks of, 123, 191 ; Old Red 
Sandstone of, 266, 273, 281, 291 ; Carbon- 
iferous geography of, 356 ; Carboniferous 
volcanoes of, 359 ; Carboniferous plateaux 
of, 367 ; Carboniferous puys of, 414 ; Permian 
volcanoes of, ii. 55 ; Tertiary dykes of, 122 ; 
Tertiary basalt -plateaux of, 208, 274, 304 ; 
Tertiary gabbros of, 327 ; Tertiary acid rocks 
of, 379 
Scrope, G. P., i. 27, 32, 45, 116 ; ii. 373, 374, 
381 
Sedgwick, A., i. 142, 166, 175, 218, 227, 257 ; 
ii: 1, 2, 3, 5, 113, 139, 153, 157 
Segregation (see Differentiation) 
Segregation- veins, i. 84, 92 ; ii. 66, 130, 300, 303 
Selwyn, Mr. A. C. R., i. 143, 175, 208, 221 
Semi-opal, ii. 79 
Sepulchre Mountain, i. 79 
Serpentine, i. 195, 293 
Shale, alteration of, i. 72, 451 1 ii. 164 ■ 
Shap, granite of, i. 236, 238, 271, 290 
Sheets, intrusive ( see. Sills) 
Shelve, i. 176, 190 
Shetland, i. 271, 289, 292, 293, 345 
Slriant Isles, ii. 307 
Shineton Shales, i. 144 
Shore-lines, traces of ancient, i. 295, 305 
Shropshire, ancient volcanic rocks of, i. 129, 
189 ; latest eruptive rocks of, ii. 101 
Sicily, i. 26 
Sidlaw Hills, i. 286, 294, 303 
Sills, vitreous margins of, i. 18 ; tectonic rela- 
tions of, 77, 83, 451; origin of name, 83; 
differentiation (segregation) in, 84,^ 450 ; ii. 
476 ; ordinary stratigrapliical position of, i. 
85 ; considered as parts of ineompleted vol- 
canoes, 86 ; mstamorpbism by, 87, 94, 451 ; 
ii. 299^ 303, 310 ; conditions for injection of, 
i. 97, 98, 99, 458 ; columnar structure of, ii. 
187, 291, 301, 306, 308, 319; amygdaloidal 
structure in, 299, 312 ; banding of, 309 ; 
split by later sills, 310, 31 6 ; extreme sub- 
division of, 31 1 ; slaggy surface in some, 
312; give off veins, 313; double and 
multiple, 318, 434 ; connection with vents, 
322 
pre-Cambrian, i. 118, 124 ; Cambrian, 155, 
170, 171 ; Silurian, 187, 196, 206, 216, 237, 
249 ; Devonian, 261 ; Old Red Sandstone, 
277, 291, 321, 335, 343, 345 ; Carboniferous, 
408, 446, 472 ; ii. 2, 21, 30, 48; Permian, 
64, 66 ; of Midlands, 102, 103; Tertiary, (1) 
Basic, 298 ; (2) Acid, 366, 430 
Silurian system, i. 173; vegetation of, 174; 
geography of, 263 ; volcanoes of, 175 ; classi- 
fication of, 175 ; two volcanic scries of, 177 
volcanoes in Shropshire, i. 189 ; in Scotland, 
191 ; at Builth, 203 ; in Pembrokeshire, 205 ; 
in Caernarvonshire, 207 ; in the Berwyn Hills, 
218 ; in Anglesey, 219 ; in the Lake District, 
227 ; in Gloucestershire, 238 ; in Ireland, 
239, 254 
Skae, H. M., i. 294, 299, 306, 375 ; ii. 57 
Skiddaw, i. 228 ; granite of, 236 
Slate, i. 229 
Skomer Island, i. 207 
Skye, spkerulitic dykes and sills of, i. 20 ; 
opbitic structure from. 20 ; basalt-terraces of, 
24 ; metamorphism by granophyre of, 95, 96 ; 
volcanic scenery of, 103, 105 ; dykes of, ii. 
123, 124, 129, '139, MO, 146, 150, 152, 154, 
160, 162, 164, 165, 173, 269 ; bedded basalts 
of, 192, 249, 269 ; tuffs of, 251 ; connection 
of dykes and superficial lavas in, 269 ; 
vents in, 280 ; sills of, 304 ; gabbro bosses 
of i. 116; ii. 334; acid bosses of, 379 ; 
acid sills of, 431 ; acid dykes of, 437 ; pitch- 
stone veins of, 445 ; subsidence of, 447 
Slaggy structure, i. 16, 33, 59, 282, 327, 339 ; 
ii. 98, 187 
Slaue, volcanic rocks near, i. 244 
Slate-tuffs, i. 180, 213, 234 
Sletnish a volcanic neck, ii. 271 
Slieve Foye, ii. 421 
Gallion, ii. 200 
GulUon, ii. 422 
