ii. 3, 4, 9, 10, 12, 13, 16, 17, 20, 23, 33, 36, 37, 42, 43, 46, 48, 49,

56, 58, 65, 66, 68, 94, 95, 102, 103, 118, 121, 125, 127, 144, 145, 148, 162, 164, 170, 174, 175, 190, 192, 199, 201, 203, 253, 272, 277, 292, 347, 384, 391, 420, 422, 423, 426, 428, 433, 435, 446, 449 Giant's Causeway, ii. 80, 109, 186, 188, 192, 206 Gilbert, Mr. G. K., i. 87; ii. 362, 363 Girvan, i. 192, 200 Glaciation, absence of, in Devonshire, i. 261 Glass in volcanic rocks, i. 18, 33, 60, 78, 180, 211, 216, 230, 232, 235, 316; ii. 85, 120, 126, 133, 135, 137, 184, 204, 247, 272, 285, 316, 317 Globulites, ii. 135 Gloucestershire, Silurian volcanoes of, i. 238 Gneiss, analogies of, with igneous rocks, i. 93; ii. 476; oldest, i. 110, 115 Godwin-Austen, A. C., i. 259, 262 Goodchild, Mr. J. G., i. 229, 449; ii. 150 Grainger, Rev. Dr., ii. 198 Grand Sarcoui, ii. 373, 374, 381 Granite, bosses of, i. 88, 90, 93; plutonic and volcanic, 89; metamorphism by, 95; altered by dykes, ii. 164; pre-Cambrian, i. 119; post-Arenig in Highlands, 126, 310; in Cambrian rocks, 155; in Silurian rocks, 200, 229, 236, 238, 249; of probably Old Red Sandstone age, 272, 277, 290, 331, 337; Tertiary, ii. 366, 418, 420 Granitite, i. 188, 277, 290, 337; ii. 367 Granophyre, alteration of rocks by, i. 95, 96; scenery of, 105; solvent action of, 82, 84, 85, 96, 99; ii. 163, 392, 415, 422, 433; brecciated, 382; spherulitic, 381; bedded structure of, 381, 403, 404; apt to be intruded at the base of a volcanic series, 403; shattering of rocks invaded by, 405, 411, 413, 416, 439; veins of, 409, 410, 432, 437; Silurian, i. 214, 215 ---- Tertiary, i. 339; ii. 368, 395, 408, 430; boundaries of, 382, 409; relation to older vents, 280, 384, 399; relation to plateau-basalts, 386, 396, 402, 404; relation to gabbro, 391, 402, 404, 410; relation to basic dykes, 395; proof of liquidity of, 413; sills of, 430, 436, 437; dykes of, 435 Granophyric structure, i. 20; ii. 366 Graphite in Tertiary volcanic series, ii. 198 Graptolites, i. 174, 196, 197 Grauwacke or Devonian rocks, De la Beche on, i. 259, ii. 33 Graves, Lieut. T., ii. 451 Great Glen of Scotland, i. 121 Greeks, influence of volcanoes on, i. 1 Green, A. H., i. 133, 134, 163; ii. 10, 12 Greenland, Tertiary basalts of, ii. 182 Greenly, Mr. E., i. 129, 214 Greenock, Lord, i. 363 Green schists of the Scottish Highlands, i. 122; of Anglesey, 129 Greenstone, i. 183, 187, 206, 217, 219, 249, 259, 261; ii. 34, 35, 37, 103, 104, 355 Greenstone-ash, i. 219 Griffith, Sir R., ii. 299, 422 Gunn, Mr. W., i. 114, 298, 311, 336, 369, 407, 410; ii. 58, 172, 420 Gypsum deposits, ii. 54

Hade of dykes, ii. 139 Hæmatitic iron-ore, ii. 197 Hall, Sir James, i. 72, 363 Hälleflinta, i. 131, 167 Hardman, E. T., ii. 365, 449 Harker, Mr. A., i. 90, 91, 93, 95, 96, 99, 188, 209, 210, 211, 212, 213, 214, 217, 218, 222, 227, 228, 230, 231, 232, 235, 236, 237, 238, 290;