INDEX 
487 
Melting of rocks by igneous intrusions, i. 82, 
84, 85, 98, 99 ; ii. 163, 392, 415, 422, 433 
Menai Strait, i. 159 
Menevian group, i. 114 
Merse, volcanic plateau of the, i. 375 
Metamorpliism of tuffs, i. 157 ; of lavas (see 
under Lavas) 
by lavas, i. 27 ; by sills and bosses, 87, 
94, 95, 216, 236, 331, 33S, 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 
Micliel Li'vy, 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 
Micropeginatitie structure, i. 20, 418, 449 ; 11 . 
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 
Wyu, i. 175, 176, 184, 185 _ 
Monckton, Mr. H. W., i. 449 ; ii-_224 
Montana, lava-fields of, ii. 115, 26 / 
Montrose, volcanoes of, i. 299 
Moray Firth, basin of, i. 271, 343 
Morton, Mr. (5. H., i. 189 ^ 
Morven, basalt-plateau ol, 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 amvgdales of, i. 17 ; perlitic 
glass from, 19 ; pale lavas of, ii. 184, 213 ; 
basalt of, 18S, 192, 193; breccias of, 
196 ; plateau of, i. 24, ii. 208 ; non-voleamc 
breccias in, 196, 211 ; Hint gravel in, 211 ; 
leaf-beds of, 212 ; vents in, 274, 278 ; gabbro 
of, 366 ; 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, 1/5, 
189, 204, 205, 207, 238, 257 ; ii. 56, 9o 
Mynvdd-mawr, i. 209, 211, 216 
Mythology, influence of earthquakes and vol- 
canoes on, i. 2 
Nant Franeon, i. 161 
Naples, puys of, i. 100, 429 
Napoleonite, i. 22 
Necker, L. A., ii. 112, 123, 139 140, 146 _ 
Necks, volcanic, i. 56 ; ol fragmentary materials, 
56; of uon-volcanic detritus, 57, 289, 343, 
426 ; of agglomerate, 58 : ii. 276 ; internal 
stratification in, i. 68 ; 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 ; connec- 
tion of, with cones, 70, 435; ii. 70, 89, 277, 
281, 290 ; nietamovphism of, i. 67, 71, 82, 93, 
399 ; ii. 39, 78 ; metamorpliism of rocks 
around, i. 72, 349, 350, 352, 399. 404, 432; 
ii. 76, 272, 273, 274, 276, 280, 292 ; inward 
dip of rocks towards, i. 73, 352 ; ii. 80 ; con- 
nection of, with bosses, i. 93 ; ii. 276, 284 ; en- 
tombment mid exposure of, i. 431 ; connection 
of with valleys, 272, 366, 375 ; ii. 61, 65 ; re- 
lation between tlieir size and the character 
of the agglomerate, 76 ; connection of, with 
sheets of tuff or lava, 70, 89, 277, 284 
Siluriau, i. 215, 235 ; Old Red Sandstone, 
277, 288, 293, 311, 318, 323, 328 ; Carbon- 
iferous, 394, 399, 400, 404, 106, 424, 465 ; ii. 
13, 28, 47 ; Permian, ii. 62, 67 ; Tertiary, ii. 
202, 270, 276 
Neptunist ami Fliitonist controversy, i. 363 ; ii. 
67, 95, 110, 112 
New Mexico, necks in, i. 68 
Newry granite, i. 290 . 
Nicholson, Prof. Alleyne, i. 228, 229 
Nicol, James, i. 311, 369 
W., ii. 238 
Nigrine, ii. 79 
Nithsdale, Permian volcanic rocks of, ii. 58, 60, 
62, 65 
Nodular structure of lavas, i. 20, 162, 204, 206, 
207, 211, 232, 247, 255, 274, 346 
Nolan, Mr. J., i. 240, 251, 315 ; ii. 423, 424, 
425 
Non-volcanie debris, among volcanic rocks, i. 
31, 57, 289, 313, 345, 381, 399, 402, 422, 426, 
437 ; ii. 18, 27, 28, 58, 64, 76, 78, 99, 195, 
196, 281, 423 ; indicates comparatively feeble 
eruptions, i. 57, 289, 345, 426, 438 ; ii. 293 ; 
points to earliest eruptions of a vent, ii. 76 
Nordenskjold, Mr. O., i. J20 
North Berwick Law, i. 371, 373, 403 
North, Mr. Barker, ii. 244 
Norway, eruptive rocks of, i. 28 
Nuneaton, i. 171 
Obsidian, i. 18, 19 ; ii. 370 
(Jehil Hills, i. 274, 276, 277, 279,281, 286, 28/, 
288, 293, 303, 308, 311 
Oil-shales of the Lothians, i. 361, 362 462 
O’Kelly, .1., i. 349 ; ii. 49 
'Oldham, TV, ii. 299 , 
Old Red Sandstone, lines of vents in,__ 1. 69 ; 
granite protrusions of, 236, 272, 277, 290, 
337 ; of County Waterford, 251 ; distribution 
in Britain, 257 ; an exceptional stratigra- 
phies! type, 258 ; conditions of its deposit, 
259, 263,’ 297 ; original scenery of, 265 ; vegeta- 
tion of, 265 ; isolation of tlie water-basins of, 
shown by fossil evidence, 265 ; classification 
of, 266 ; history of the investigation of 268 ; 
volcanic centres in, 271 ; nature of volcanic 
products in, 273 ; structure of lavas and tuffs 
of, 281 ; volcanoes of, 259, 263, 294, 303, 323, 
325, 337, 341, 843, 346, 348, 352 ; sub- 
