257. Map of the chief dykes between Lochs Ridden and Striven (C. T. Clough, Geological Survey, Sheet 29) 170 258. Basalt-veins traversing granophyre, St. Kilda 173 259. Section of scoriaceous and prismatic basalt, Camas Tharbernish, north shore of Canna Island 187 260. Banded amygdaloidal basalt showing layers of elongated and steeply inclined vesicles, Macleod's Maidens, Skye 191 261. Termination of basalt-beds, Carsaig, Mull 193 262. Breccia and blocks of mica-schist, quartzite, etc., lying between bedded basalts, Isle of Mull 197 263. Section of Knocklayd, an outlier of the Antrim basalt-plateau lying on Chalk 202 264. Diagram-Section of the Antrim Plateau 203 265. View Of Basalt escarpment, Giant's Causeway, with the Amphitheatre and Chimneys. (From a photograph by Mr. R. Welch) 207 266. Basalt-capping on the top of Ben Iadain, Morven 209 266_a_. View of the south side of Staffa, showing the bedded and columnar structure of the basalt 210 267. View of Rum from the harbour of Canna 216 268. Section of the cliffs below Compass Hill, Isle of Canna 218 269. Lava cutting out conglomerate and shale. Shore below Canna House 224 270. Section of shales and tuffs, with a coniferous stump lying between two basalt-sheets, Cùl nam Marbh, Canna 225 271. Dùn Mòr, Sanday. (From a photograph by Miss Thom) 226 272. View of the Dùn Beag, Sanday, seen from the south. (From a Photograph by Miss Thom) 230 273. View of Dùn Beag, Sanday, from the north. The island of Rum in the distance. (From a Photograph by Miss Thom) 231 274. Section of eastern front of Dùn Beag 232 275. Enlarged section on the western side of Dùn Beag 233 276. Geological map of the Island of Eigg 235 277. Section of the geological structure of the Island of Eigg 236 278. View of the Scuir of Eigg from the east 237 279. Natural section at the cliff of Bideann Boidheach, north-west end of the Scuir of Eigg 239 280. View of the Scuir of Eigg from the south 242 281. View of the Scuir of Eigg from the south-west of the Loch a Bhealaich, showing the bedded character of the mass 243 282. Section at the base of the Scuir of Eigg (east end) 244 283. Terraced hills of basalt plateau (Macleod's Tables), Skye 250