94. Section across the Duneaton volcanic district from the head of the Duneaton Water to Kirklea Hill 330 95. Cavernous spaces in andesite, filled in with sandstone, John o' Groats Port, Turnberry, Ayrshire 333 96. Section of andesites, Turnberry Castle, Ayrshire 334 97. Lenticular form of a brecciated andesite (shown in Fig. 96), Turnberry, Ayrshire 334 98. Section across the volcanic area of St. Abb's Head (after Prof. J. Geikie) 339 99. View of terraced andesite hills resting on massive conglomerate, south of Oban 341 100. Section of lava-escarpment at Beinn Lora, north side of mouth of Loch Etive, Argyllshire 342 101. Section across Strathbogie, below Rhyme, showing the position of the volcanic band 344 102. View of Knockfeerina, Limerick, from the north-east--a volcanic neck of Upper Old Red Sandstone age 349 103. Section of the volcanic zone in the Upper Old Red Sandstone, Cam of Hoy, Orkney 351 104. Section of the volcanic zone in the Upper Old Red Sandstone at Black Ness, Rackwick, Hoy 351 105. Section across the volcanic band and its associated necks, Hoy, Orkney 352 106. Ground-plan of volcanic neck piercing the Caithness Flagstone series on the beach near John o' Groat's House 353 107. View of the escarpment of the Clyde Plateau in the Little Cumbrae, from the south-west 368 108. View of the edge of the Volcanic Plateau south of Campbeltown, Argyllshire 370 109. View of North Berwick Law from the east, a phonolite neck marking one of the chief vents of the Garleton Plateau. (From a photograph) 371 110. The Bass Rock, a trachytic neck belonging to the Garleton plateau, from the shore at Canty Bay 372 111. Corston Hill--a fragment of the Midlothian Plateau, seen from the north 373 112. View of Arthur Seat from Calton Hill to the north 374 113. View of Arkleton Fell, part of the Solway Plateau, from the south-west 376 114. Vertical sections of the escarpment of the Clyde plateau from north-east to south-west 384