CHAPTER XVII. Distribution of the Volcanic Centres in the Lower Old Red

Distribution of the Volcanic Centres in the Lower Old Red Sandstone--Characters of the Materials Erupted by the Volcanoes 271

CHAPTER XVIII

Structure and Arrangement of the Lower Old Red Sandstone Volcanic Rocks in the Field 281

CHAPTER XIX

Volcanoes of the Lower Old Red Sandstone of "Lake Caledonia"

Description of the several Volcanic Districts: "Lake Caledonia," its Chains of Volcanoes--The Northern Chain: Montrose Group--Ochil and Sidlaw Hills--the Arran and Cantyre Centre--the Ulster Centre 294