Fuego, Tierra del, rush of, xviii, 189.
Fuel, E. North on, xi, 66.
—, amount of, consumed in New York city, xvi, 360.
—, economy of, W. R. Johnson, xxiii, 318.f
—, of coal tar and water, C. Daubeny, xxviii, 71.
[Fulgurites,] or lightning tubes in sand, xx, 396.
—, siliceous tubes, Rome, N. Y., C. E. West, xlv, 220.
—, near Dresden, remarkable, xlvi, 210.
—, in chalk, cause of, C. Lyell, xxxviii, 122.
Fuller's earth in Connecticut, ii, 217.