ii. 10, 20, 42, 47, 49, 101, 103, 105

Jurassic period, physical conditions of the, ii. 108, 182

Kelly, J., i. 314 Kenmare, Old Red Sandstone volcanic rocks of, i. 350 Keratophyre, i. 247 Kerrera, Isle of, i. 342 Kersantite, i. 261 Keswick, i. 229 Kildare, Chair of, Bala volcanic rocks at, i. 245, 256 Killarney, nodular lavas of, i. 20, 272, 346 Kilpatrick Hills, i. 385, 388, 403, 410 Kilroe, Mr. J. R., i. 251, 253, 315 Kilsyth type of dolerite and basalt, i. 418 Kinahan, Mr. G. H., i. 349; ii. 45, 49, 426 Kincardineshire, volcanic necks of, i. 281, 286, 293, 299; Old Red Sandstone of, 301 King, Mr. Clarence, i. 27 King's County, volcanic necks of, ii. 37 Kippie Law type of basalt, i. 418 Kirkby, Mr. J., ii. 106 Kirwan, R., ii. 110 Knockfeerina, Old Red Sandstone volcanic rocks of, i. 349 Knocklayd, ii. 200 Kynaston, Mr. H., i. 343

Labyrinthodonts, i. 356 Laccolites, i. 77, 83, 86, 88, 98, 99, 190; ii. 363 Lacroix, Prof., i. 96 Lacustrine volcanic eruptions, i. 49 Lagorio, Dr. A., ii. 137 Lake, Mr. P., i. 177, 179 Lake-District, i. 227, 290; Vesuvian cone of, i. 42, 45 "Lake Caledonia," i. 272, 294, 296 "Lake of Lorne," i. 341 "Lake Orcadie," i. 266, 271, 343, 350 Lakes, eruptions in, i. 49; crater, 58; of Old Red Sandstone, 264 Lambay Island, conglomerates of, i. 244 Lammermuir, granites of, i. 290, 340 Lamplugh, Mr. G. W., i. 32, 220; ii. 23, 28 Lamprophyre, i. 291, 293 Lanarkshire, i. 291, 368, 416 Land, sculpture of the, i. 101, 102 Landslips, ii. 200, 287 Lankester, 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 Laurentian 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, 184, 193, 201, 240, 244, 252; seldom occur in solitary sheets, 26; variations in structure in, 27; sequence of, in 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. 78; 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; Scotland, 191; Builth, 203; Pembrokeshire, 205; Caernarvonshire, 207; Berwyn Hills, 218; Anglesey, 219; Lake District, 227; Gloucestershire, 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 character of, 193; of Antrim, 199; irregular bedding 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 Leckstone, 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 Sandstone volcanic rocks of, i. 348 Limestone, metamorphism of, i. 72, 451; ii. 14, 22, 164, 280, 383 Lindley 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 Llanberis, Pass of, i. 159, 163 ---- group, i. 144 Llandeilo group, i. 175, 196, 242; volcanic rocks of, 186, 202, 221, 227, 241 Llandeiniolen, i. 160 Llandovery group, i. 175, 196; possible volcanic rocks of, 238 Llangadock, i. 205 Llangefni, i. 220 Llanllyfni, i. 161 Llanwrtyd, i. 204 Lleyn Peninsula, i. 208, 209, 213, 215 Lloyd Morgan, Prof., i. 145, 147, 154 Llyn Padarn, i. 157, 159, 160 Loch Carron, pre-Cambrian rocks of, i. 115, 117 Loch Lomond, dykes at, ii. 180 Loch Tay Limestone, i. 122, 124, 125 Lomas, Mr. J., ii. 191, 322 Longulites, ii. 135 Lonsdale, W., i. 257 Longmyndian rocks, i. 111, 129, 132 Lorne, 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 Lycopods, fossil, i. 174

Maare, 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 Macknight, 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 in, 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;