---- ----, ----, ibid, _Thienemann_, x, 187. ---- ----, ----, ibid, xiv, 97; xvi, 290; xix, 235. ---- ----, ----, ibid, _Hansteen's_ views, xiv, 109. ---- ----, ----, ibid, _Ideler's_ views, xxviii, 289. ---- ----, ----, ibid, _J. Ross_, xxix, 348. ---- ----, ----, ibid, _B. F. Joslin_, attributing it to crystallized vapor, xxx, 390; xxxv, 145. ---- ----, ----, ibid, _F. A. P. Barnard_, xxxiv, 284. ---- ----, ----, ibid, _D. Olmsted_, xxxii, 180. ---- ----, ----, _Mr. Rowall's_ theory of, xli, 41. ---- ----, height of, _M. Mairan_, xxxiv, 288. ---- ----, ----, _M. Farquharson_, xxxiv, 288. ---- ----, ----, _D. Olmsted_, xxxiv, 286. ---- ----, ----, _M. Wartmann_, xxxiv, 288. ---- ----, ----, _M. Dalton_, xxxiv, 288. ---- ----, ----, _Dr. Richardson_ of Capt. Franklin's Expedition, xxxiv, 289. ---- ----, noises of, an illusion, _Capt. Scoresby_, xxviii, 58. ---- ----, ----, ibid, _D. Olmsted_, xxxiv, 289. ---- ----, periodical, _D. Olmsted_, xxxii, 177. ---- ----, no polarization by light of, _J. Henry_, xxxix, 366. ---- ----, work by _Mairan_, alluded to, xxix, 388; xxxii, 177. Auroral cloud of Dec., 1835, _A. C. Twining_, height and position of, xxxii, 217. Auroral arch of Aug., 1836, _A. C. Twining_, height and position of, xxxii, 220. ---- ---- of May, 1836, height of, _A. C. Twining_, xxxii, 224. ---- ----, in Vermont, Sept., 1838, _J. Dean_, xxxv, 380. ---- belt of May, 1840, _E. C. Herrick_, xxxix, 194, 383. Aurum Millium, a new metal, ii, 363. Auscultation, iii, 375. Australia, minerals of, _F. Alger_, xxxix, 157.^f Australian Boomerang, or Kilee notice of, xxxvi, 164.^f Autumnal coloration of leaves, _Macaire Prinsep's_ view of, xvi, 215. Automolite, locality in Connecticut, xii, 156. ----, ---- New Jersey, v, 402. Aventurine feldspar, _M. Scheerer_, xlix, 394. _Avogadro_, elastic force of the vapor of mercury, xxiv, 286. Axinite in Canada, viii, 62. Azote, see Nitrogen. B. _Babbage, C._, on the decline of science in England, xx, 164. ----, fees of admission to learned societies of Britain, xx, 165. ----, list of men of science who have held offices under governments, xx, 172. ----, number of members of some societies, xx, 173. ----, calculating machine and constants of, xxviii, 64. ----, analytical engine of, xlvi, 205. Babel, tower of, xxxvii, 352. _Bache, A. D._, safety apparatus for steamboats, xx, 317.^f ----, disturbance of the needle during the aurora borealis, xxvii, 113.^f ----, on the meteors of Nov. 13, 1833 and 1834, xxix, 383. ----, influence of color on radiation, xxx, 16. ----, radiation and absorption of heat, specific heat, and apparatus for illustrating, xxviii, 320.^f ----, corresponding magnetic observations by, along with _Prof. Lloyd_ of Dublin, xli, 210. ----, effect of deflected current of air, on the results with a rain gauge, xxxv, 287. ----, appointed to the coast survey, xlvi, 213.