ii. 76, 272, 273, 274, 276, 280, 292;

inward dip of rocks towards, i. 73, 352; ii. 80; connection of, with bosses, i. 93; ii. 276, 284; entombment and exposure of, i. 434; connection of with valleys, 272, 366, 375; ii. 61, 65; relation between their size and the character of the agglomerate, 76; connection of, with sheets of tuff or lava, 70, 89, 277, 284 ---- Silurian, i. 215, 235; Old Red Sandstone, 277, 288, 293, 311, 318, 323, 328; Carboniferous, 394, 399, 400, 404, 406, 424, 465; ii. 13, 28, 47; Permian, ii. 62, 67; Tertiary, ii. 202, 270, 276 Neptunist and Plutonist 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-volcanic 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;