I.

_Ianthina fragilis_, its range, &c., 650.

Ice, animals imbedded in, 83.

Ice of rivers, transporting power of, 219. ----, drift, influence of, on temperature, 95. ----, predominance of, in antarctic circle, 98. ----, formation of field, 107. ----, transportation of rocks by, 155, 219, 521.

Icebergs, formation of, 96, 97. ----, distance to which they float, 100, 227. ----, limits of glaciers and, 228. ----, plants and animals transported by, 622, 639. ----, action of, when stranded, 228. ----, rocks transported by. _See_ Ice. ----, floating in Northern hemisphere, 86. ----, not all formed by glaciers, 228.

Iceland, icebergs stranded on, 97. ----, geysers of, 246, 553, 555.

Iceland, volcanic eruptions in, 424. ----, comparison between the lavas of Central France and, 426. ----, new island near, 425. ----, polar bear drifted to, 679.

Igneous action. _See_ Volcanic.

Igneous causes. _See_ Book II. ----, the antagonist power to action of running water, 198, 563, 711.

Ilford, tertiary strata at, 76.

Imbedding of organic remains. _See_ Fossilization.

India, buried cities in, 729, 731. ----, terrestrial mammalia of, 632.

Indo-pacific province of mollusca, 649.

Indus, delta of. recent changes in, 459, 769. ----, buried ships in, 758.

Infusoria in bog iron-ore, 722. ----, in volcanic rocks in Mexico, Peru, &c., 388.

Infusorial tuff, Pompeii, 388.

Inland cliffs, no proof of sudden elevation, 531. ----, seas, deltas of, 255.

Insects, geographical distribution of, 654. ----, certain types of, distinguish particular countries, 655. ----, their agency in preserving an equilibrium of species, 671. ----, fossil, 748.

Instincts, migratory, occasional development of, in animals, 642. ----, hereditary, 593, 596. ----, modified by domestication, 595.

Insular climates, description of, 94.

Inverness-shire, inroads of sea on coast of, 302.

Irawadi, R., silicified wood of, noticed in 1692, 28.

Ireland, raised beaches on coast of, 122. ----, reptiles of, 645. ----, peat of, and fossils in, 719, 720, 724. ----, deposits in progress off coast of, 774.

Iron, melting point of, 539. ----, in wood, peat, &c., 722. ----, instruments taken up from sea, 760.

Ischia, hot springs of, 247, 456. ----, eruptions and earthquakes in, 360, 365, 456.

Islands, vegetation of small, 112, 615, 667. ----, animals in, 635. ----, formed by the Ganges, 276. ----, migrations of plants aided by, 622. ----, new volcanic, 43, 425, 432, 468. ----, coral, 775. ----, of driftwood, 640.

Isle of Purbeck, vertical chalk in, 318.

Isle of Wight, mammiferous fossils of, 142. ----, waste of its shores, 317.

Isothermal lines, Humboldt on, 95.

Italian geologists, their priority, 19, 23. ----, of the 18th century, 33.

Italy, tertiary strata of, 64, 74.

J.

Jack, Dr., on island of Pulo Nias, 794.

Jamaica, earthquakes in, 350, 504, 517. ----, subsidence in, 504, 517. ----, rain diminished in, by felling of forests, 713. ----, a town swept away by sea in, 731.

Java, volcanoes and earthquakes in, 354, 464, 498, 502. ----, valley of poison in, 353. ----, subsidence of volcano of Papandayang in, 493. ----, river-floods in, 503, 748, 751.

Jones, Sir W., on Institutes of Hindoo law, 5.

Jorullo, eruption of, 349, 428.

Juan Fernandez, 357, 453, 499, 686.

Jukes, Mr., on cliffs in Island of Timor, 794. ----, on volcanic islands near Java, 354. ----, on coral reef, 784.

Jura, Saussure on the, 45.

Jutland, inroads of sea in, 330.

K.

Kamtschatka, volcanoes in, 353. ----, new island near, 468.

Kangaroo, extirpation of; to Australia, 684.

Kashmir. _See_ Cashmere.

Katavothrons of Greece, breccias formed in, 734.

Kazwini on changes in position of land and sea, 19.

Keilhan, Prof., of Christiana, on changes of level in Norway, 529, 531.

Keith on dispersion of plants, 620.

Kent, loss of land on coast of, 312.

Kentucky, caves in limestone, 733.

Keyserling, Count, on lowland of Siberia, 84.

Kincardineshire, village in, washed away by sea, 302.

King, Captain P., on humming birds in Tierra del Fuego, 97, 643. ----, on currents in Straits of Magellan, 293. ----, on coral reefs, 788.

King, Mr., on cattle lost in bogs in Ireland, 723. ----, on submerged cannon, 759.

Kinnordy, Loch of, insects in marl in, 748. ----, canoe in peat of, 759.

Kirby, Rev. Mr., on insects, 606, 655, 673, 674.

Kirwan, his geological Essays, 56. ----, on connection of geology and religion, 56.

Knight, Mr., on varieties of fruit trees, 589.

Konig, Mr., on Guadaloupe human skeleton, 757. ----, on fossils from Melville Island, 88.

Koran, cosmogony of the, 17.

Kotzebue on drifted canoe, 662.

Kunker, concretionary limestone of Ganges, 280.

Kurile Isles, active volcanoes in, 353.