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 geological problem which has not been sufficiently considered, 12; characteristic aspect of vegetation in the tropics, 30; characteristic vegetation of the Alps and Andes at great elevations, 35.

Vesuvius, measurements of height at different periods, ii. 225, 243; particulars of the eruption of 1822, 228.

Vital force, the, or Rhodian Genius, ii. 251.

Volcanos of the Thian-schan chain situated in the interior of Asia far distant from the sea, i. 88; structure and mode of action of, ii. 213; instances of extensive volcanic connection, 221; importance of repeating exact measurements of the heights of craters, 224.

Willows, ii. 28, 193.

THE END.

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