— —, 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