Burntisland, Binn of, i. 428, 429, 433, 435, 457, 459
Burntisland Sill type of dolerite, i. 418, 421
Busz, Mr. K., i. 261
Bute, Isle of, i. 369, 378, 407

Cadell, Mr. H. M., i. 114, 423; ii. 334
Cader Idris, volcanic rocks of, i. 42, 175, 176, 177, 178, 179, 180, 181, 182, 188, 207
Caer Caradoc, i. 131, 132, 170
Caerfai group (Cambrian), i. 155
Caernarvonshire, volcanic rocks of, i. 159, 207
Caithness Flags, i. 343, 352
—— volcanic vents in, i. 352
Calciferous Sandstones, i. 361, 366, 415
Calcite as a matrix of tuffs, ii. 27, 39, 41
Caldecote volcanic rocks, i. 170
Callaway, Dr. C., i. 126, 130, 132, 134, 220, 221
Calton Hill, lavas and tuffs of, i. 373, 378, 385, 386, 389
Cambrian system, i. 112, 123, 133, 139, 143, 144;
volcanoes of, 145, 159
Campbeltown, volcanic rocks of, i. 312, 386
Campsie Fells, i. 102, 368, 369, 384, 386, 389, 393, 397, 398, 400, 403, 410, 412, 447
Canary Islands, i. 27
Canna, basalts of, ii. 184, 187, 190, 215, 216;
vent in, 288
Cantyre, volcanic rocks of, i. 311, 369, 370, 386
Caradoc group, i. 175, 196
Carbonaceous rocks, influence of, on igneous masses, i. 95, 426, 449, 456; ii. 65, 87, 104, 165
Carboniferous Limestone, origin of, i. 357
—— system, subdivisions of, in Britain, i. 358, 360, 366;
ancient geography of, 355, 361, 362, 432, 462;
flora and fauna of, 356
—— volcanic plateaux, distribution of, i. 364, 367;
nature of materials constituting, 377;
structure of, 383;
bedded lavas and tuffs of, 383;
vents of, 54, 394, 399
—— Puys, i. 46, 47, 308, 364;
of Scotland, 414;
nature of the materials erupted by, 416;
necks of, 424;
bedded lavas and tuffs of, 417, 436, 440;
sills of, 446, 472;
bosses of, 458, 465;
dykes of, 460;
of Derbyshire, ii. 8;
Isle of Man, 22;
of Somerset, 32;
of Devonshire, 32;
of King's County, 37;
of Limerick, 41
Carlingford, igneous rocks of, i. 96; ii. 175, 371, 420
Carnedd Dafydd, i. 209
Carnmony Hill, ii. 272
Carrock Fell, differentiation in rocks of, i. 91;
metamorphism at, 94, 96;
as a volcanic boss, 235, 236
Cement-stone group, i. 362, 366, 387, 418, 462
Cellular structure of volcanic rocks, i. 15, 33
Chalk, metamorphism of, by a dyke, ii. 164
Champernowne, A., i. 260, 262
Charnwood Forest, i. 134; ii. 53
Cherts associated with volcanic rocks, i. 123, 167, 169, 173, 174, 184, 196, 197, 240, 254; ii. 25, 36
Cheviot Hills, i. 102, 271, 272, 274, 275, 277, 278, 290, 293, 336
Chilled margin in intrusive rocks, i. 81, 83; ii. 126, 158, 160, 172, 299, 303, 310, 317, 321, 392, 402
Christiania, eruptive rocks of, i. 28
Chronology, volcanic, how determined, i. 46
Clark, Mr. G. T., ii. 180
Claystone, i. 277, 279, 318, 324, 327; ii. 403
Cleavage, effects of, on igneous rocks, i. 162, 165, 224, 231, 232, 234, 237, 260, 261; ii. 36
Clee Hills, ii. 101, 102
Cleveland Dyke, ii. 1, 122, 139, 140, 142, 144, 146, 147, 150, 153, 167, 168, 169
Clough, Mr. C. T., i. 114, 201, 236, 274, 290, 337; ii. 123, 124, 127, 128, 132, 137, 138, 142, 145, 146, 152, 162, 171, 172, 316, 384, 437
Clyde, Carboniferous volcanic plateau of, i. 368, 384, 385, 393, 400, 407, 411
Coal interbedded among volcanic rocks, i. 392, 423; ii. 198, 213, 251, 287
—— alteration of, at volcanic vents, i. 72; ii. 64
—— alteration of intrusive rocks by, i. 95, 451
—— alteration of by sills, dykes, etc., ii. 67, 164, 166
Coal-measures, i. 358, 360, 366
Coalbrookdale Coal-field, ii. 103
Cole, Prof. G. A., i. 176, 177, 178, 179, 180, 181, 184, 187, 188, 210, 211; ii. 134, 205, 212, 245, 370, 371, 378, 426
Colorado, Grand Cañon of, i. 30;
laccolites of, 86
Columnar structure, i. 25, 27, 343, 378, 385, 459; ii. 164, 186, 206, 301
Comley Sandstone, i. 144
Cones, volcanic, connection of, with necks, i. 70;
contemporaneous denudation of, 73; ii. 202, 218, 230;
entombment of, i. 433, 463; ii. 66
Conglomerates, volcanic, i. 31, 37, 183, 190, 286, 300, 307, 309, 310, 314, 315, 330, 341; ii. 195, 198, 218, 284
Coniston Limestone, i. 229, 231
Contemporaneity in Geology, 201
Continents, origin of, i. 11
Contraction, effects of terrestrial, i. 12, 97, 98
Conybeare, J. J., ii. 95
—— W., i. 171; ii. 9, 95, 110, 113, 199
Cooling, effects of, in inducing varieties of texture in igneous rocks, i. 78, 79, 81; ii. 274, 275, 299, 303, 310, 317, 392, 402
Coon Butte, Arizona, i. 58
Cork, County, volcanic breccias of, ii. 49
Corndon, sill of, i. 176, 189, 190
Corston Hill, i. 373, 386, 387
Craiglockhart type of dolerite and basalt, i. 418
Crater, consolidation of tuff within a, i. 429
Crater-lakes, i. 58; ii. 266, 275
Cretaceous period, geography of the, ii. 108, 182
Cross Fell, i. 228, 229, 238
Cross, Mr. Whitman, i. 86
Crush-conglomerates or breccias, i. 32, 220, 223, 225, 244; ii. 281, 347, 352
Crushing, mechanical effects of, i. 315 (see Schist)
Crust, contraction of the terrestrial, i. 12, 97, 98;
oldest rocks of, 110;
deformation of, 117, 121, 264, 295, 297
Cryptocrystalline type of basalt, i. 419
Crystallites of volcanic rocks, i. 18
Crystals, different periods of formation of, in volcanic rocks, i. 19, 20, 21, 421; ii. 128, 131, 134, 135;
ejected by volcanic vents, i. 62, 178, 180, 181, 195, 213, 234, 245; ii. 27, 49, 58, 79

Cuillin Hills, scenery of, i. 106;
gabbro of, ii. 329, 361;
acid rocks of, 391
Culots, i. 78, 88
Culm-measures, ii. 33
Cumbrae Islands, i. 368, 369, 378, 407
Cumming, J. G., ii. 22
Cycles, volcanic, i. 27, 92; ii. 116

Dacite, i. 230; ii. 185
Dakyns, Mr. J. R., i. 90, 229, 272; ii. 10
Dalmellington, volcanic rocks at, i. 333; ii. 62
Dalmeny type of dolerite and basalt, i. 418, 420
Dalradian rocks, probable crushed necks of, i. 75, 125;
lavas and sills of, 121;
green schists of, 124
Dalry, Ayrshire, buried volcanoes of, i. 434
Dana, J. D., ii. 189
Darwin, C., i. 27
Daubrée, A., i. 72, 404
Davies, J., i. 156, 157
Dechen, H. von, i. 46; ii. 112, 280, 333, 340, 367, 372, 381
Deformation, effects of, on volcanic rocks, i. 75, 115, 117, 119, 121, 127, 129, 162
De la Beche, H., i. 142, 143, 170, 175, 204, 205, 207, 259; ii. 9, 10, 19, 33, 95, 96, 97
Delessite, ii. 79
Denudation, influence of, on volcanoes, i. 3, 4, 8, 40, 43, 45, 46, 54, 58, 71, 73, 75, 79, 87, 100-107, 370, 433, 434, 436, 476; ii. 55, 61, 62, 179, 181, 182, 241, 245, 248, 249, 255, 257, 282, 283, 292, 316, 317, 363, 373, 407, 455
Derbyshire, toadstones of, i. 359; ii. 8
Desmarest, ii. 373
Devitrification of volcanic rocks, i. 18, 19, 78; ii. 437, 446
Devonian system, i. 257;
volcanoes of, 259
Devonshire, volcanic scenery of, i. 103;
Devonian volcanic rocks of, 259;
Carboniferous volcanic rocks of, ii. 32;
Permian volcanic rocks of, 94
Diabase, i. 151, 153 (analyses), 156, 192, 194, 204, 206, 214, 217, 235, 240, 247, 249, 273 (analyses), 278, 292, 318, 320, 330, 335, 344, 345, 351, 403; ii. 5, 136, 415
Diabase-porphyrite, i. 192, 204
Diamond found in volcanic vents, i. 62
Dick, Mr. A., jun., i. 380
Dickson, Mr. E., ii. 23
Differentiation in igneous rocks, i. 22, 27, 84, 85, 90, 91, 449; ii. 300, 475
"Dimetian," i. 145
Dingle-beds, i. 346
Dingle, Upper Silurian nodular lavas of, i. 20, 254
Diorite, i. 78, 247, 249, 277, 278, 288; ii. 36
Dirrington Law, i. 290
Dittmar, Prof., ii. 137
Dolerite, i. 119, 134, 178, 190, 206, 230, 247, 261, 378, 403, 407, 417, 448; ii. 5, 11, 35, 49, 102, 103, 104, 125, 136, 157, 183, 271, 299, 303, 307, 319, 328
Dolgelli, i. 169, 178, 188
Donegal, Dalradian rocks of, i. 122;
dykes in, ii. 124
Drogheda, volcanic rocks near, i. 244
Duffin, W. le S., ii. 426
Dumbarton, rocks near, i. 402, 404
Dumfoyn, a volcanic neck, i. 395, 398, 400
Dumgoyn, a volcanic neck, i. 395, 397, 398, 400
Dundee, sills and bosses near, i. 292, 306
Duneaton Water, volcanic rocks of, i. 329
Dunite, ii. 309
Du Noyer, G. V., i. 245, 250, 254; ii. 272, 426
Durham, Mr., i. 275
Durness Limestone, i. 112, 121, 123, 141
Dust, volcanic, i. 13
Dutton, Capt. C. E., i. 68; ii. 267
Dykes, vitreous margins of, i. 18;
formation of, 54, 98;
in necks, 66;
filled with agglomerate, 70;
grouping of, among intrusive rocks, 77;
character of, 79;
extent of, in Britain, 80;
age of, 81;
compound, 81; ii. 59;
expulsion of lava from, i. 82; ii. 128;
connected with the surface, i. 82;
pre-Cambrian, 118;
flow-structure in, 161;
Cambrian, 156;
Silurian, 187, 216, 235, 237, 248, 249;
Old Red Sandstone, 277, 291, 338, 345;
Carboniferous, 406, 429, 460; ii. 1, 30;
Permian, 83;
amygdaloidal structure of, 85
—— Tertiary, ii. 114;
arguments for their geological age, 118, 125, 171;
geographical distribution, 121;
two types of protrusion of, 122;
nature of component rocks of, 125;
external character of, 126;
classification of basic, 129;
enclosed fragments in, 129, 131, 144;
porphyritic and amygdaloidal structures of, 128, 129, 130;
veins in, 130;
joints in, 132, 166;
microscopic characters of, 134;
chemical characters of, 137, 139;
hade of, 139;
breadth of, 139;
interruptions of, 142;
length of, 142;
persistence of mineral characters of, 144;
direction of, 145, 159;
upward termination of, 147;
known vertical extension of, 150;
evidence of movement of molten rock of, 151;
branches and veins from, 152;
connection with sills, 155;
intersecting, 158;
compound or of more than one infilling, 159;
double, treble, and multiple, 160, 318, 417, 439;
compound, with basic and acid bands, 161, 435;
contact metamorphism of, 163;
relation of, to geological structure, 166;
origin and history of, 175;
Icelandic example of, 261;
example communicating with cinder cone in Utah, 268;
connection of, with surface, 179, 269, 280;
latest protrusions of, 381, 408, 416;
of granophyre, 435, 436, 437, 439

Earth, condition of the interior of the, i. 10;
fractures in crust of the, 11
Earthquakes, influence of, on early man, i. 1;
transient effects of, 3, 8
East Lothian, trachyte lavas of, i. 24;
Carboniferous volcanic plateau of, 370, 389, 403, 409
Edinburgh, volcanic rocks near, i. 24, 102, 104, 269, 273, 276, 279, 281, 285, 287, 289, 291, 293, 311, 317, 318, 323, 364, 370, 373, 385, 386, 387, 389, 410, 420, 436, 449
Egan, Mr. F. W., i. 242; ii. 201, 423
Eifel, i. 4, 46, 58, 100
Eigg, Isle of, ii. 115;
pitchstone of, 185, 217, 242, 445;
brecciated basalt in, 189, 192;
basalt plateau of, 215, 234;
Scuir of, 217, 234, 447;
sills of, 318;
acid bosses of, 403;
acid sills of, 431;
proofs of subsidence at, 447;
enormous denudation of, 239, 447, 458