INDEX 
485 
Hornblende, ejected crystals of, i. 178, 181 ; 
ii. 49, 51, 58, 79 
Hornblende-schists formed from basic igneous 
rocks, i. 75, 114, 118, 119, 124, 129 
Horne, Mr. John, i. 114, 196, 199, 200, 344, 
345, 375 ; ii. 23, 144, 292 
Ilornito of a lava-stream, i. 55 ; ii. 264 
Hornstone, 1. 131, 136, 277, 278 (analyses), 324 
Houston Marls, i, 423, 436, 440, 444, 466 
Howard, Mr. H. T., i, 207 
Howell, Mr. II. H., i. 294, 307, 364 
Hoy, Island of, i. 350 
Hughes, Prof. T. M‘K., i. 126, 144, 160, 161, 
166, 1 68, 220, 222, 223, 227 
Hull, Mr. E., ii. 42, 95, 103, 272, 421, 426, 449 
Hurlet Limestone, i. 360, 366, 394, 410, 415, 
444, 452, 456, 467, 470, 474 
Huroniau rocks, i. Ill 
Hutchings, Mr. W. M., i. 227, 230, 233 
.Hutton, James, i. 363 ; ii. 9, 110 
Hutton, W. , ii. 3 
Hyperite, i. 279 
Hysgeir, pitclistone of, ii. 246 
Icelanii, Tertiary basalts of, ii. 1S2, 260 ; Ter- 
tiary gabbros and lipavites or granophyres of, 
261 ; continuity of volcanic phenomenon of, 
261; lava- fields of, i. 24, 42, 53, 100; ii. 
260 ; lava-domes of, i. 10 ; ii. 265 ; fissures 
of, i. 70; ii. 262, 271, 454; dykes of, 122, 
261 : cinder cones of, 264, 271 ; subsidence 
of, 447 
Idahoe, lava-fields of, ii. 267 
Iddings, Prof., i. 28, 29, 30, 78, 79, 82, 84, 90 ; 
ii. 128, 178 
Idiomorphic crystals, i. 21, 417, 420 ; ii. 40 
Index Limestone of the Scottish coal-fields, i. 
360, 444, 452 
India, fissure - eruptions of, i. 10; volcanic 
plateau of, ii. 180 _ 
Intermediate volcanic rocks, silica - percentage 
of, i. 14 
Intersertal structure, i. 417 ; ii. 136 
Intrusive rocks, defined, i. 14 ; occasional 
cellular character of, 16 ; How-structure in, 
22, 161 ; varieties of, 77 ; textures of, 78, 
449 ; ii. 274, 360, 392 ; in sheets, sills, ami 
laceoliten, i. 83 ; melting of rocks by, 82, 84 ; 
ii. 129, 163, 392 ; consolidation of, i. 84 ; 
banding of, 84, 450 ; ii. 329, 342 ; heterogeneity 
of, i. 85 ; ii. 344 ; metamorphism by, i. 94, 451 ; 
influence of surrounding rocks on, 95 ; con- 
ditions of their intrusion, 97 ; columnar 
structure in, ii. 187, 291, 301 
Pre-Cambrian, i. 116; Cambrian, 156; 
Silurian, 187, 195, 206, 216, 235, 237, 
248, 249 ; Devonian, 261 ; Old lied Sand- 
stone, 277, 291, 321, 335, 338, 343, 345 ; 
Carboniferous, 406, 408, 420, 446 ; ii. 1, 21, 
30, S3. 40, 48 ; Permian, 58, 64 ; Tertiary, 
270, 298 
Ireland, submarine eruptions of, i. 48 ; Dal- 
radian rocks of, 122, 123, 126 ; Arenig 
rocks in, 123 ; Silurian volcuuic rocks of, 
239, 251 ; granites of, 290 ; Old Red Sand- 
stone volcanic rooks of, 346, 348 ; Carbon- 
iferous volcanic rocks of, 359 ; ii. 37 ; early 
observers among the Tertiary volcanic rocks 
of, 109 ; Tertiary basalt plateau of, 364, 
370, 371 ; gabbros of, 359 ; acid rocks of, 
420 
Iron-ore, pisolitic (Arenig), i. 181, 208 ; Ter- 
tiary, of Antrim, ii. 204 
Irvine, Mr. D. R., i. 294, 299 
Irving, Rev. A., ii. 95 
Isogeotlierms, shifting of, i. 98 
Jtaly, old volcanoes of, i. 4 ; ii. 474, 477 
Jack, Mr. R. I,., i. 294, 308, 369, 375, 396, 
404 ; ii. 57, 145 
Jameson, Robert, i. 268, 269, 317, 363 ; ii. 
109, 161, 244, 333, 355, 364 
Jan Mayen, ii. 182 
Jedburgh type of dolerite and basalt, i. 418 
Jennings, Mr. C. V., i. 176, 177, 179, 180, 181, 
184, 185, 186, 187, 188 
Johnston-Lavis, Dr., ii. 261 
Joints in dykes, ii. 132 
Judd, Prof. J. W„ i. 157, 275 ; ii. 115, 116, 
134, 137, 162, 185, 209, 211, 245, 247, 267, 
274, 278, 280, 303, 307, 309, 315, 316, 319, 
322, 328, 329, 332, 333, 349, 356, 360, 372, 
388, 410, 439 
Jukes, J. II., i. 143, 171, 175, 208, 218, 219, 
245, 246, 250, 254, 316 ; 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 
Keratopliyre, i. 247 
Kerrera, Isle of, i. 342 
Kersantite, i. 261 
Keswick, i. 229 
Kildare, Clmir 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. II., 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 
Kinvan, 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 , 11. 
363 
Lacroix, Prof., i. 96 
Lacustrine volcanic eruptions, 1. 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 Lome,” i. 341 
“ Lake Orcadie,” i. 266, 2rl, 343, 3»0 
Lakes, eruptions in. i. 49 ; crater, 08 ; ot Old 
Red Sandstone, 264 
Lambay Island, conglomerates of, 1. 244 
Lammormuir, granites of, i. 290, 340. 
Lamplugh, Mr. G. W., i. 32, 220 ; 11. 23, 28 
