234.
----, well, at Fort William, near Calcutta, 280.
----, well in delta of Po, 257.

Artesian wells near London, 234.
----, wells, phenomena brought to light by, 233, 538.

Arve, sediment transported by the, 258.
----, section of dabris deposited by, 289.

Ascension, Island of, bounded by lofty shores, 622.
----, fossil eggs of turtle from, 771.

Ashes, volcanic, transported to great distances, 106, 349, 464.

Asia, subject to earthquakes, 9.
----, coast of, changed, 18.
----, causes of extreme cold of part of, 94.
----, Minor, gain of land on coast of, 260.
----, Western, great cavity in, 692.

Ass, wild, 638, 686.

Astruc, on Delta of Rhone, 258.

Atchafalaya, R., 264.
----, drift-wood in, 267.

Atlantic, mean depth of, 104.
----, its relative level, 294.
----, rise of the tide in, 295.
----, absence of coral reefs in, 796.

Atlantis, submersion of, 9.

Atolls described, 782, 786.
----, theory of, Mr. Maclaren's objections to, 792.

Atrio del Cavallo, 381.

Aubenas, fissures filled with breccia near, 741.

Austen, Mr. R. A. C., on shores of English Channel, 319.
----, on new strata formed in, 341.

Australia, animals of, 139, 143, 684.
----, coral reefs of, 776, 784.
----, land quadrupeds of, 633.

Auvergne, salt springs in, 248.
----, carbonic acid gas disengaged in, 248.
----, state of in tertiary period, 122.
----, fossils in volcanic ashes of, 349.
----, volcanic rocks of, 48.
----, tertiary red marl and sandstone of, 158.

Ava, fossils of, 28.

Avantipura, in Cashmere, 763.

Avernus lake, 368.

Avicenna on cause of mountains, 17.

Axmouth, great landslip near, 321.

Azores, icebergs drifted to, 99.
----, volcanic line from, to central Asia, 354.
----, siliceous springs of, 246.

B.

Babbage, Mr., on the coast near Puzzuoli, 507.
----, on Temple of Serapis, 517.
----, on expansion of rocks by heat, 562.

Bachman, Mr., on birds, 643, 644.

Bacon, Lord, cited, 765.

Baden, gypseous springs of, 245.

Baffin's Bay, icebergs in, 96.

Bagnes, valley of, bursting of a lake in the, 210.

Baiae, changes on coast of the bay of, 507.
----, ground plan of the coast of, 507.
----, sections in bay of, 508, 510.

Baker, on Caspian, mud volcanoes at, 448.

Baker, Lieut., on fossil quadrumana, 144.

Bakewell, Mr., on formation of soils, 709.
----,