lley, 123-125

Tristan da Cunha, 37

Tristram, Canon, 127, 131

Utah, volcanoes of, 137

Verbeek, R. D. M., 202

Vesuvius, 4, 14, 41-60, 67, 229

Volcanoes,
historic notices of, 1-5;
form, structure, and composition of, 10-19;
lines and groups of active, 20-29;
of mid-ocean, 30-40;
extinct or dormant, 84 _et seq._;
special volcanic and seismic phenomena, 201 _et seq._;
the ultimate cause of volcanic action, 225 _et seq._;
whether we are living in an epoch of special volcanic activity, 253-256;
brief account of volcanic rocks, 259-265

Vulcanists, 5

Vulcano, 69, 71

Wallace, A. R., 81

Waltershausen, W. S. von, 7, 61

Wellington, Mount, 149

Wharton, Capt., 212

Whymper, E., 18

Yarmuk, valley of the, 129, 131

Yellowstone Park, 145

Zirkel, F., 260

Zoellner, 240

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