n volcanoes, 548, 550.
----, his analysis of peat, 718.

Davy, Dr., on Graham Island, 436, 549.
----, on helmet taken from sea near Corfu, 760.

De Beaumont. _See_ Beaumont, De.

Debey, Dr., of Aix, on cretaceous dicotyledons, 133.

De Candolle, on hybrid plants, 605.
----, on distribution of plants, 613, 616.
----, on agency of man in dispersion of plants, 625.
----, on stations of plants, 670.
----, on barriers separating botanical provinces, 703.
----, on number of land plants, 705.
----, on longevity of trees, 422.

Dechen, Von, map of Germany, &c., 123.

Dee, R., bridge over, swept away by floods, 208.

Deer, their powers of swimming, 636.
----, diminished number in Great Britain, 683.
----, remains of, in marl lakes, 752.

De la Beche, Sir H., on rocks in S. Wales, 91.
----, on delta of Rhone in Lake of Geneva, 253.
----, on storm of Nov., 1824, 321.
----, on submarine forests, 323.
----, on earthquake of Jamaica, 1692, 504.
----, on action of rain in the tropics, 713.

De la Hire, on fossil wood from Ava, 1692, 28.

Delhi territory, elephants in, 81.

Delta of the Adige and Brenta, 256.
----, of the Brahmapootra or Burrampooter, 275.
----, of the Ganges, 275 to 284.
----, of the Mississippi, 263 to 275.
----, of the Mississippi, antiquity of. 271.
----, of the Nile, 261.
----, of the Po, 256.
----, of Rhone, in Lake of Geneva, 252.
----, of Rhone, in Mediterranean, 258.

Deltas, chronological computations of age of, 253, 285.
----, of Lake Superior, 253.
----, grouping of strata in, 286.

De Luc, his treatise on Geology, 56.
----, on conversion of forests into peat mosses, 721.

De Luc, M. G. A., his natural chronometers, 726.

Deluge, ancient theories on, 18, 23, 25, 31, 42, 155.
----, fossil shells referred to the, 20.

Deluges, local, how caused, 7, 269.
----, traditions of different, 7, 11, 42, 331, 356, 500, 501.

Demaillet, speculative views of, 572.

Denudation can only keep pace with deposition, 154.
----, effects of, 708.

Deposition of sediment, shifting of the area of, 188.
----, and denudation parts of the same process, 154.

Deshayes, M., on fossils of tertiary, 184.

Desmarest, his definition of geology, 3.
----, on Auvergne, 49.

Desnoyers, M., on human remains in caves, 739.

Desor, M., on glacier motion, 224.

Deucalion's deluge, 12.

Deville,