ii. 386, 390, 392;

conditions for the injection of, i. 97, 99 Magnesian Limestone, ii. 54 Malvern, pre-Cambrian volcanic rocks of, i. 133; Cambrian volcanic rocks of, 169 Man, Isle of, Carboniferous volcanic rocks of, ii. 22 Manod, i. 184 Marl Slate, ii. 54 Marl, volcanic, i. 423, 436, 440, 444, 466 Marr, Mr. J. E., i. 227, 228, 230, 231, 232, 236, 237, 238, 290; ii. 189 Matlock Bath, ii. 13, 22 Mediterranean, earthquakes and volcanoes of, i. 1 Melaphyre, i. 131 Mello, Mr. J. M., ii. 22 Melrose, rocks near, i. 397, 398, 400, 425 Melting of rocks by igneous intrusions, i. 82, 84, 85, 96, 99; ii. 163, 392, 415, 422, 433 Menai Strait, i. 159 Menevian group, i. 114 Merse, volcanic plateau of the, i. 375 Metamorphism of tuffs, i. 157; of lavas (_see_ under Lavas) ---- by lavas, i. 27; by sills and bosses, 87, 94, 95, 216, 236, 331, 338, 431; ii. 7, 22, 36, 131, 148, 163, 299, 300, 310, 337, 339, 340, 347, 355, 356, 357, 358, 362, 378, 383, 386, 397, 399, 400, 404, 413 ---- in vents, i. 67, 71, 82, 93, 399, 404; ii. 39, 78, 292 ---- around vents, i. 72, 349, 350, 352, 399, 404, 432; ii. 76, 272, 273, 276, 280, 292 ---- regional, i. 121, 123; ii. 35 Mica, ejected crystals of, in volcanic breccias, ii. 49, 58, 79, 80 Mica-porphyrite, i. 277, 338 Michel Lévy, M., i. 18, 21, 46, 88; ii. 373, 374 Microgranite, i. 131, 215, 235, 249; ii. 367, 437 Microlites of igneous rocks, i. 18, 21, 33; ii. 135, 275 Micropegmatitic structure, i. 20, 418, 449; ii. 5, 368, 437 Microscopic examination of rocks, i. 18, 21 Midlands, eruptive rocks of English, ii. 100 Midlothian, Carboniferous volcanic plateau of, i. 373, 385, 387; sills of, 446 Miller, Hugh, ii. 237 ---- Mr. H., i. 336 Mills, Abraham, ii. 109 Millstone grit, i. 358, 360, 366 Minette, i. 277, 278, 291, 293 Minto Crags, i. 375, 397 Mitchell, Rev. Hugh, i. 301 Moel Siabod, i. 175 ---- Wyn, i. 175, 176, 184, 185 Monckton, Mr. H. W., i. 449; ii. 224 Montana, lava-fields of, ii. 115, 267 Montrose, volcanoes of, i. 299 Moray Firth, basin of, i. 271, 343 Morton, Mr. G. H., i. 189 Morven, basalt-plateau of, ii. 208 Mountain-chains, origin of, i. 11, 12, 98 Mourne mountains, granite of, i. 93; ii. 124, 366, 367, 420 Muck, Isle of, ii. 215 Mud-lava, ii. 85 Mudstone, volcanic, i. 423, 436, 440, 444, 466; ii. 86, 222, 258 Mull, branching amygdales of, i. 17; perlitic glass from, 19; pale lavas of, ii. 184, 213; basalt of, 188, 192, 193; breccias of, 196; plateau of, i. 24, ii. 208; non-volcanic breccias in, 196, 211; flint gravel in, 211; leaf-beds of, 212; vents in, 274, 278; gabbro of, 355; acid bosses of, i. 20; ii. 395; acid sills of, 430; acid dykes and veins of, 443; enormous denudation of, 457, 461 Murchison, R. I., i. 113, 121, 129, 142, 173, 175, 189, 204, 205, 207, 238, 257; ii. 56, 95 Mynydd-mawr, i. 209, 211, 216 Mythology, influence of earthquakes and volcanoes on, i. 2

Nant Francon, i. 161 Naples, puys of, i. 100, 429 Napoleonite, i. 22 Necker, L. A., ii. 112, 123, 139, 140, 146 Necks, volcanic, i. 56; of fragmentary materials, 56; of non-volcanic detritus, 57, 289, 343, 426; of agglomerate, 58; ii. 276; internal stratification in, i. 63; ii. 80, 294; with central lava-plug, i. 64, 430; with dykes and veins, 66, 430; ii, 291; of lava-form material, i. 67, 430; ii. 271; parasitic, i. 69; connection of, with cones, 70, 435; ii, 70, 89, 277, 281, 290; metamorphism of, i. 67, 71, 82, 93, 399; ii. 39, 78; metamorphism of rocks around, i. 72, 349, 350, 352, 399, 404, 432;