_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. ----, ----, ibid, New Lebanon, _T. Kendall_, vii, 337.^f ----, ----, seen in Kentucky, August, 1825, xi, 325.^f ----, ----, seen in Rhode Island, September, 1816, xi, 328.^f ----, ----, seen in Tennessee, at Jackson, x, 368.^f Hambato, S. America, account of, xxiv, 382. _Hamilton, J._, on terrestrial magnetism, xxxvii, 100. _Hamilton, M._, earthquakes of S. America, xli, 57. Hammer, new mineralogical, _E. Hitchcock_, vii, 175.^f _Hansteen's_ journey in Siberia, notice of, xvii, 392. _Harden, J. M. B._, formula for ascertaining the weight and volume in a mixture of two bodies, xxxvii, 289. _Hare, C._, perchloric ether, xl, 50; xlii, 63. ----, on the destructive distillation of the sulphate of etherine, xxxvi, 77. ----, reaction of sulphuric acid with the essential oil of hemlock, xxxvii, 246. _Hare, R._, acids and salts, remarks on the nature of, xxvii, 63, 67. ----, ----, classes of, xxvii, 69. ----, air pump of a new construction, xxxiii, 237.^f ----, alkanet, as a substitute for litmus, v, 348. ----, ammonia, nitrate, on the preparing of pure, v, 348. ----, atoms, on the views of _Faraday_, respecting, xlviii, 247. ----, amphide salts, on the existence of radicals in, xlv, 52, 247. ----, barium, strontium and calcium, extrication of, xxxvii, 267; xxxviii, 115; xxxix, 362; xl, 293.^f ----, blasting rocks, by galvanic ignition, xxi, 139; xxvi, 352.^f; xxxviii, 188. ----, blowpipe, improved alcohol, vii, 110.^f ----, ----, hydrostatic, xi, 135.^f ----, ----, strictures on a publication entitled Clark's gas blowpipe, ii, 281.^f ----, ----, oxy-hydrogen, fusion of a large amount of platina with, xxxiii, 195; xxxv, 328. ----, boron, process for evolving, xxii, 189; xxiv, 249.^f ----, calorimotor, i, 413.^f; v, 94. ----, ----, for igniting platina in the galvano-ignition apparatus, xxxii, 284.^f ----, carbon, on the fusion of, in reply to _L. Vanuxem_, viii, 288; x, 111. ----, ----, experiments on the fusion of, x, 118. ----, ----, ----, remarks on, xxxviii, 190. ----, carbonic acid, apparatus for exhibiting some of the properties of, xiv, 358.^f ----, carbonic oxide, apparatus for separating from carbonic acid, xxiv, 252.^f ----, chemical nomenclature, xxvii, 63; xxxii, 259. ----, ibid, in a letter to _Berzelius_, xlix, 249. ----, Chemistry, compendium of, noticed, xx, 95.