Alpnach, slide of, xxiv, 124. Alps, notice of _Hugi's_ Travels in, with some account of the geology of, xxviii, 296. ----, Bernese, ascent of the high peak Fisteraarhorn, by _Hugi_, xxviii, 301. ----, atmospheric "cannonade" in, xxviii, 303. ----, notice of Forbes's travels in, and account of icebergs, xlvi, 172. Alum, manufacture of, at Salem, Mass., vi, 372. ----, manufacture of, at Glasgow, xli, 49. ----, used for alabaster, xxx, 168. ---- method of coloring crystal of, vii, 194. ----, native, of a cavern in Southern Africa, xxviii, 290. ----, ----, in Connecticut, iii, 240; viii, 256; x, 12. ----, ----, in Massachusetts, i, 114; viii, 235. ----, ----, in New York, vi, 95; ix, 44; xv, 243. ----, ----, in Vermont, viii, 243. ----, in mica slate, xx, 418. ----, magnesian, or Pickeringite, analysis of, _A. A. Hayes_, xlvi, 360. ---- earth, and alum manufactory, Maryland, xxvii, 12. Alumslate, iii, 28. Alumstone, iii, 245. Alumina, use of, with pigments for the pallet, xvi, 173. Aluminium, obtained by _W. W. Mather_, xx, 408. ----, characters of, _F. Wöhler_, xlix, 390. ----, chloride of, _W. W. Mather_, xxvii, 241, 248, 253. Amalgam of gold, alembic for distilling, _M. F. Maury_, xxxiii, 66.^f Amber, vegetable origin of, ii, 353. ----, origin of, xxviii, 293. ----, _Berendt_ on, xxxvii, 365. ----, from Ava, xxviii, 71. ----, from the Chesapeake and Delaware Canal, xvii, 292. ----, from Maryland, iii, 8. ----, from the island of New Providence, x, 171. America, early discovery of, by the Scandinavians, xvii, 410. Amethyst, in the Canadas, viii, 63. ----, in Massachusetts, i, 113. ----, in New Jersey, ii, 197. ----, in Nova Scotia, xxx, 348. ----, in Rhode Island, viii, 199, 229. ----, in the Western States, i, 132; vii, 48. Amianthus, in Connecticut, vi, 225. ----, in Massachusetts, i, 343. ----, in New Jersey, v, 266. ----, in New York, i, 54; v, 29; ix, 40. ----, in Pennsylvania, viii, 239; x, 219; xiv, 9, 17. Ammelide, _M. Liebig_, xxix, 373. Ammeline, _M. Liebig_, xxix, 373. Ammonia, formation of, xiv, 387; xlvii, 193. ----, action of iron upon, xviii, 146. ----, action of, on butyric ether, xlviii, 191. ----, an antidote against poisons, xvi, 182. ----, in argillaceous minerals, xv, 182. ----, in the rust of iron, ix, 191. ----, in native oxide of iron, xxi, 155. ----, disengaged from growing plants, x, 190. ----, decomposition of salts of, at the ordinary temperature, _H. B. Jones_, xlix, 392. ----, bitungstate of, _W. W. Mather_, xxvii, 264. ----, commercial carbonate of, _M. Scanlan_, xxxv, 297. ----, preparation of nitrate of, _R. Hare_, v, 346. Ammonia and Magnesia, carbonate of, xlix, 200. Ammonia and Zinc, carbonate of, xlix, 200. Ammoniacal gas, inflammability of, vi, 185. ---- salts, solvent and oxidating powers of, _J. P. Emmet_, xviii, 255. Ammonites in Canada, viii, 84. ----, see farther _Zoology--Mollusca_.