486 
THE ANCIENT VOLCANOES OF GREAT BRITAIN 
Lamprophyre, i. 291, 293 
Lanarkshire, i. 291, 368, 416 
Land, sculpture of the, i. 101, 102 
Landslips, ii. 200, 287 
Lankcster, Prof. E. Ray, i. 310 
Lapilli, volcanic, i. 33, 34, 61, 151 
Lapworth, Prof. C., i. 130, 132, 137, 171, 172, 
189, 190, 196 
Largs, volcanic vent near, i. 56, 396, 397, 401 
Lasaulx, Prof, von, ii. 365, 371,426 
Laurcutian gneiss, i. 110 
Lavas, classification of, i. 14 ; flow-structure of, 
16, 21 ; vesicular structure of, 17 ; glass in, 
18; devitrification of, 19; bedding of, 24; 
effect of water on molten, 25, 334 ; sack-like 
or pillow-structure of, 26, 1S4, 193, 201, 240, 
244, 252 ; seldom occur iu solitary sheets, 
26 ; variations iu structure in, 27 ; sequence 
of, iu eruptions, 28, 92, 377, 386 ; crusts of, 
disrupted in volcanic explosions, 58, 59, 60 ; 
ii. 189 ; alternations of acid and basic, i. 28, 
61, 152, 157, 165, 207, 213, 284, 318; 
ii. 236, 266; contrasted with intrusive rocks, 
i. 7S ; sandstone veins in, 283, 300, 303, 320, 
327, 333, 337 ; ii. 59, 98 ; shattered or 
agglomerate structure of, 99 ; metamorphism 
of, i; 231, 240, 338 ; ii. 272, 276, 337, 339, 
340, 347, 355, 379, 386, 397, 399, 400, 404, 
413 
Cambrian, i. 152, 168 
Silurian of Merionethshire, i. 183 ; Scot- 
land. 191 ; Builtli, 203 ; Pembrokeshire, 205 ; 
Caernarvonshire, 207 ; Benvyn Hills, 218 ; 
Anglesey, 219 ; Lake District, 227 ; Glou- 
cestershire, 238 ; Ireland, 239, 254 
Lower Old Red Sandstone, i. 273, 281, 294, 
317 
Carboniferous, i. 377, 384, 417, 436, 440, 
443 ; ii. 8, 18, 34, 45 
Permian, ii. 68, 96 
Tertiary, ii. 183; types of, 186; banding 
of, 189 ; thickness of, 192 ; lenticular char- 
acter of, 193 ; of Antrim, 199 ; irregular bed- 
ding of the vitreous, 243 
■ modern Icelandic eruptions of, ii. 261 
Lava-domes, ii. 265 
Lava-plug of volcanic funnels, permanence of, 
i. 40, 41, 55, 73, 76, 430 
Lawson, Prof. A. C., i. 82 
Leaf-beds, ii. 198 
Lebour, Prof. , i. 336 ; ii. 2, 3, 5, 7 
Leokstone, i. 419, 442, 443 
Lecoq, H., i. 45 ; ii. 373 
Leinster granite, ii. 245, 249, 290 
Lewisian Gneiss, i. 81, 110, 111, 113, 118 
Liddesdale, Carboniferous volcanic vents of, i. 
55, 416, 425, 440, 475 
Life, earliest traces of, i. 140 
Lignite in Tertiary volcanic series, ii. 198 
Limburgite, i. 377” 408, 417, 420, 448 ; ii. 40, 46 
— — type, i. 418 
Limerick, Carboniferous volcanic rocks of, i. 
421, 430 ; ii. 41 ; Old Red Saudstone vol- 
canic rocks of, i. 348 
Limestone, metatnorpbism of, i. 72, 451 ; ii 
14. 22, 164, 280, 383 
Liudley and Hutton on Eigg conifer, ii. 238 
Lingula Flags, i. 144, 177 
Linlithgowshire ( see West Lothian) 
Lintrathen, porphyry of, i. 277, 292, 311 
Lion’s haunch type of dolerite and basalt, i. 418 
Lithomarge, ii. 197, 204 
Lizard, rocks at the, i. 194 
Llanbevis, Pass of, i. 159, 163 
group, i. 144 
Llandeilo group, i. 175, 196, 242 ; volcanic- 
rocks of, 186, 202, 221, 227, 241 
Llandciniolen, i. 160 
Llandovery group, i. 175, 196 ; possible volcanic 
rocks of, 238 
Llangadoek, i. 205 
Llangefni, i. 220 
Llanllyfui, i. 161 
Llanwrtyd, i. 204 
Lleyn Peninsula, i. 208, 209, 213, 215 
Lloyd Morgan, Prof., i. 145, 147, 154 
Llyii Padarn, i. 157, 159, 160 
Loch Carron, pre-Cambrian rooks of, i. 115, 
117 • 
Loch Lomond, dykes at, ii. 180 
Loch Tay Limestone, i. 122, 124, 125 
Lomas, Mr. J., ii. 191, 322 
Longuiites, ii. 135 
Lonsdale, W., i. 257 
Lougmymlian rocks, i. Ill, 129, 132 
Lome, volcanic rocks of, i. 102, 271, 281, 341 
Lough Mask, Silurian volcanic rocks of, i. 251 
Nafooey, Silurian volcanic rocks of, i. 251 
Neagh, subsidence of site of, ii. 201, 205 ; 
history of, 448 
Ludlow group, i. 175 
Lvcopods, fossil, i. 174 
Maahe, volcanic, i. 58 ; ii. 287, 288, 296 
Macconochie, Mr. A., ii. 58 
Macculloch, John, i. 95, 269, 270 ; ii. 22, 111, 
113, 123, 140, 154, 156, 159, 172, 174, 175. 
213, 217, 231, 237, 244, 251, 280, 293, 304- 
307, 310, 314, 315, 327, 349, 364, 371, 403, 
406, 408, 409, 418 
Mackuight, Dr., i. 268, 317 
Maclaren, Charles, i. 269, 317, 325, 363, 372, 
373,' 451, 462 ; ii. 67 
M ‘Henry, Mr. A., i. 32, 240, 242, 244, 314, 
347 ; ii. 201, 204, 272, 293, 426, 427, 428, 
429 
.M‘Mahon, General, i. 260 ; ii. 35, 36 
Magma, volcanic, explosive energy of, i. 13 ; 
gases and vapours dissolved iu, 13, 72, 97, 
99 ; differentiation of, 22, 84, 91 ; solvent 
action of, 82, 84, 85, 99 ; ii. 392, 415, 422, 433 ; 
heterogeneity of, i. 85, 90, 91 ; ii. 344, 360, 
476 ; metamorphic action of, i. 94 ; alteration 
of, by incorporation of foreign material, 96 ; 
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 
Man-, 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 
