235. Plan of basalt-veins with selvages of black basalt-glass, east side of Beinn Tighe, Isle of Eigg 126 236. Arrangement of lines of amygdales in a dyke, Strathmore, Skye 130 237. Systems of joints in the dykes 132 238. Section of cylindrical vein or dyke, cutting the bedded lavas, east side of Fuglö, Faroe Islands 133 239. Joint-structures in the central vitreous portion of the Eskdale Dyke (B. N. Peach) 133 240. Microscopic structure of the vitreous part of the Eskdale Dyke 136 241. Section along the line of the Cleveland Dyke at Cliff Ridge, Guisbrough (G. Barrow), scale, 12 inches to 1 mile 147 242. Section along the course of the Cleveland Dyke, at the head of Lonsdale, Yorkshire (G. Barrow, in the _Memoirs of the Geol. Survey_, Geology of Cleveland, p. 61) 148 243. Section across the extreme upper limit of Cleveland Dyke, on the scale of 20 feet to one inch (Mr. G. Barrow) 149 244. Upper limit of Cleveland Dyke in quarry near Cockfield (after Mr. Teall) 149 245. Section along the course of the Cleveland Dyke across the Cross Fell escarpment (scale of one inch to one mile) 150 246. Branching portion of the great dyke near Hawick (length about one mile) 153 247. Branching dyke at foot of Glen Artney (length about four miles) 153 248. Basic veins traversing Secondary limestone and sandstone on the coast cliffs, Aidnamurchan 155 249. Section showing the connection of a Dyke with an Intrusive Sheet, Point of Suisnish, Skye 156 250. Section to show the connection of a Dyke with an Intrusive Sheet, Stirlingshire Coal-field 157 251. Intersection of dykes in bedded basalt, Calliach Point, Mull 158 252. Basalt veins traversing bedded dolerites, Kildonan, Eigg 159 253. Ground-plan of intersecting dykes in Lias limestone, Shore, Harrabol, East of Broadford, Skye 159 254. Compound dyke, Market Stance, Broadford, Skye 162 255. Section of coal rendered columnar by intrusive basalt, shore, Saltcoats, Ayrshire 164 256. Dolerite dyke with marginal bands of "white trap," in black shale, Lower Lias, Pabba 166