M., on contraction of granite, 173.
----, on trachytes, 440.

Devonian strata formed in deep seas, 117.

Diatomaceae, 388.

Dikes, composition and position of, 379.
----, how caused, 379.

Diluvial waves, no signs of on Etna, 423.
----, theory of earlier geologists, 25.

Diodorus Siculus cited, 357.

Dion Cassius cited, 364.

Dodo, recent extinction of the, 684.

Dog, varieties of the, 570, 584.
----, hybrids between wolf and, 601.
----, acquired instincts hereditary in, 593.
----, has run wild in America, 686.

Doggerbank, 340.

Dollart, formation of estuary of the, 329.

Dolomieu on Val di Noto, Vicentin, and Tyrol, 49.
----, on lavas of Etna, 49.
----, on decomposition of granite, 249.
----, on earthquake of 1783 in Calabria, 473, 475, 478, 480.

Domestication, aptitude of some animals for, 593, 599.
----, influence of, 595.

Don, river, rocks transported by, 208.

Donati on bed of Adriatic, 38, 71, 774.

Donny, Mr., cited, 557.

D'Orbigny, M. A., on abrupt transition from one fossil
fauna to another, 184.

Dorsetshire, landslip in, 321.
----, waste of cliffs of, 319.

Dove, Mr., map of isothermal lines, 93.

Dover, waste of chalk cliffs of, 314.
----, depth of sea near, 315.
----, formation of Straits of, 315.
----, strata at foot of cliffs of, 314.

Downham buried by blown sand, 727.

Dranse, R., 210.

Drift, northern, fossil marine shells in, 186.

Drift-sand, fossils in, 727.

Drift-wood of Mississippi, 268.
----, abundant in North Sea, 744.

Drontheim, 529.

Droughts in S. America, animals destroyed by, 696.

Druids, their doctrines, 16.

Dufresnoy, M., geological map of France, 122.
----, on formation of Monte Nuovo, 371, 372.
----, on tuffs of Somma, 382.
----, on lavas of Vesuvius, 384.

Dujardin, M., on shells, &c., brought up by artesian well at Tours, 236.

Dumont, M., cited, 120, 328.

Dumoulin, M. on earthquakes in Chili, 453.

Dunes, hills of blown sand, 305, 307.

Dunwich destroyed by the sea, 310.

Durand, Lieut., on fossil quadrumana, 144.

Dureau de la Malle, M., cited, 584, 593.

Durham, waste of coast of, 303.

D'Urville, Capt, on temperature of Mediterranean, 296.

E.

Earth, antiquity of the, 21.
----, on changes in its axis, 80.
----, proportion of land and sea on surface, 125.
----, spheroidal form of the,