Unionidæ of the country of the Iguanodon, G. A. Mantell, xlvii, 402.f
Unit, linear, proposed by Davy, xvii, 164.
United States, earliest census of, xxxiii, 278.
—, magnetic chart of, E. Loomis, xxxiv, 290; xxxix, 41.
—, plan for the survey of the coast, xvi, 225.
—, architecture in, xvii, 99, 249f; xviii, 11, 212.
—, culture of silk in, xviii, 278.
—, statistics of iron in, xxii, 179.
—, Medical and Surgical Journal, noticed, xxvii, 180.
—, Naval Lyceum, xxvii, 390.