d Metamorphic action 175

CHAPTER XIII.
Supposed alternate periods of repose and disorder--Opposite
doctrine, which refers geological phenomena to an
uninterrupted series of changes in the organic and inorganic
world, unattended with general catastrophes,
or the development of paroxysmal forces 180

BOOK II. (CHAPTERS XIV. to XXXII.)

OBSERVED CHANGES IN THE INORGANIC WORLD NOW IN PROGRESS: FIRST,
THE EFFECTS OF AQUEOUS CAUSES, SUCH AS RIVERS, SPRINGS,
GLACIERS, WAVES, TIDES, AND CURRENTS; SECONDLY, OF IGNEOUS
CAUSES, OR SUBTERRANEAN HEAT, AS EXHIBITED IN THE VOLCANO AND
THE EARTHQUAKE.

CHAPTER XIV.
Aqueous causes--Excavating and transporting power of rivers 198

CHAPTER XV.
Carrying power of river-ice--Glaciers and Icebergs 219

CHAPTER XVI.
Phenomena of springs 232

CHAPTER XVII.
Reproductive effects of rivers--Deltas of lakes and inland
seas 251

CHAPTER XVIII.
Deltas of the Mississippi, Ganges, and other rivers exposed
to tidal action 263

CHAPTERS XIX. XX. XXI.
Denuding, transporting, and depositing agency of the waves,
tides, and currents--Waste of sea-cliffs on the coast
of England--Delta of the Rhine--Deposition of sediment
under the influence of marine currents 290, 321, 337

CHAPTER XXII.
Observed effects of igneous causes--Regions of active
volcanoes 344

CHAPTERS XXIII. XXIV.
History of the volcanic eruptions of the district round
Naples--Structure of Vesuvius--Herculaneum and Pompeii 360, 375

CHAPTER XXV.
Etna--Its eruptions--Structure and antiquity of the cone 396

CHAPTER XXVI.
Volcanoes of Iceland, Mexico, the Canaries, and Grecian
Archipelago--Mud volcanoes 424

CHAPTER XXVII.
Earthquakes and the permanent changes attending them 451

CHAPTER XXVIII.
Earthquake of 1783 in Calabria 471

CHAPTER XXIX.
Elevation and subsidence of dry land, and of the bed of
the sea during earthquakes--Evidence of the same afforded
by the Temple of Serapis