Hall, J., Western States, general account of geology of, xlii, 51.
Hall, John, on the staining of wood, and on medical electricity, iii, 166.
Hallowell, B., on the cause of hail in warm weather, xv, 361.
—, blue color of sky, twinkling of stars, and on the deception as to the number in view on a clear evening, xv, 360.
Halos, theory of, E. S. Snell, xlix, 73.f
—, lunar, West Point, March 20, 1831, xx, 299.
—, solar, seen in N. York, at Cazenovia, J. W. Tyler, xxi, 189.
—, —, ibid, in Otsego Co., Feb. 1823, xx, 297.
—, —, ibid, at Kingston, R. H. Bonnycastle, xxx, 136.
—, —, ibid, at West Point, A. C. Twining, xxxii, 229.