—, silicon, mode of obtaining, xxii, 189; xl, 28.
—, —, apparatus for evolving from fluo-silicic acid, xxiv, 247.f
—, silver, nitrate of, preparation of pure, v, 348.
—, on specific gravities, xi, 121.f
—, storms of the Atlantic coast, v, 352.
—, —, on Redfield's theory of, xlii, 140; xliii, 122.
—, —, on Dové's essay on, xliv, 137; xlviii, 220.
—, —, replies of W. C. Redfield to, xlii, 299; xliii, 250f; xliv, 384.
—, —, or tornado in R. Island, Aug. 1838, and others, xxxviii, 73.
—, —, tornado and water spout, causes of, xxxii, 153.f