.
----, volcanoes of, 349, 546.

Meyen, Dr., on earthquake in Chili, 1822, 458.

Michell on phenomena of earthquakes, 41.
----, on the geology of Yorkshire, 42.
----, on earthquake at Lisbon, 358, 497.
----, on retreat of the sea during earthquakes, 498.
----, on wave-like motion of earthquakes, 558.
----, on earthquakes cited, 499.

Microlestes, triassic mammifer, 138, 145.

Middendorf, Mr., on Siberian mammoth, 81.

Migrations of plants, 618.
----, of animals, 635, 636.
----, of cetacea, 642.
----, of birds, 642.
----, of fish, 646.
----, of zoophytes, 653.
----, of insects, 655.

Migratory powers indispensable to animals, 689.

Milford Haven, rise of tides at, 291.

Millennium, 20, 32.

Mineral waters, their connection with volcanoes, 237.
----, ingredients most common in. _See_ Springs, 237.

Mineralization of plants, 747.

Mines, heat in, augments with the depth, 538.

Miocene strata of Suffolk, fossils of, 142.
----, proportion of living species in fossil shells of the, 183.

Mississippi, its course, delta, &c., 268, 275.
----, drift-wood of the, 261.
----, earthquakes in valley of, 270, 350.
----, antiquity of delta of, 272.
----, earthquake region of, 467.
----, banks higher than swamps, 266.

Missouri, R., 264.

Mitchell, Dr., on waste of cliffs, 311.

Moel Tryfane, recent marine shells on, 122.

Mollusca. _See_ Testacea.
----, provinces of, 649.

Molluscous animals, longevity of species of, 76.

Moluccas, eruptions in the, 504.

Monkeys, fossil, 144.

Monte Barbaro, description of, 373.
----, Bolca, fossil fish of, 44.
----, Nuovo, formation of, 369, 518.
----, Somma, structure of, 382.

Monti Rossi on Etna described, 397, 399, 422.

Montlosier, on Auvergne, 49.

Moraines of glaciers, 223, 226, 228.

Morayshire, town in, destroyed by sea, 302.
----, effect of floods in, 208, 730.

Morea, Caramiqne of, 731.
----, osseous breccias now forming in the, 734.
----, human remains imbedded in, 735.

Moriot, on subsidence in Adriatic, 257.

Moro, Lazzaro, his geological views, 34.
----, on primary rocks, 52.

Morocco, earthquakes at, 358.

Morton, Dr. S. G., on hybrids and species, 601.

Mountain chains, on the elevation of, 65.
----, theory of sudden rise of, 163.

Moya of the Andes described, 348, 470.

Mud eruptions in Quito, 1797, 348.