CHAPTER XIV

The Silurian Volcanoes of Ireland 239

BOOK V

THE VOLCANOES OF DEVONIAN AND OLD RED SANDSTONE TIME

CHAPTER XV

The Devonian Volcanoes 257

CHAPTER XVI

The Volcanoes of the Old Red Sandstone

Geological Revolutions at the close of the Silurian Period Physical Geography of the Old Red Sandstone--Old Lake-basins, their Flora and Fauna--Abundance of Volcanoes--History of Investigation in the Subject 263