Cc OM 
Columbite, in Mass., xvi, 220.f 
, in New Hampshire, xvil, 357. 
, Torrelite of Thomson identi- 
eal with, J. D. Dana, xxxii, 149.f 
Combustion, facts relating to, xxviii, 
70. 
xxv, 146. 
of chlorine by olefiant gas, x, 
365. 
of coal strata, products of, 
Vili, 382. 
with spongy platina discov- 
ered, vil, 387. 
xxii l6) 5 xxvii, 178. 
! , of various substances 
described, J. Mease, xxxiii, 147. 
—— of ashes, xlii, 165.f 
Comet of 1819, il, 374. 
of 1822, notice of, ix, 199, 367. 
vill, 315. 
, Olbers’s elements of, xiii,189. 
——., Biela’s, notice of, xxiii, 390. 
——, ——,, elements a 1882, xxiv, 
346 ; mxvien lO 3) xxvills 398. 
» ——, supposed possibility of 
collision with Encke’s, xxiv, 346. 
—— of July, 1882, J. J. Littrow, 
xxiv, 348. 
——, discov’d Ap. 8, 1834,xxvi,402. 
——, Halley’s, 1835, xxix, 155. 
——. , E. Loomis, xxx, 209. 
»——, remarkable phenome- 
na of, xxxv, 285. 
, Encke’s, remarks on, xxiv, 
S465 xxx, Los xxxv,a88! 
——. , notice of, xxxvil, 191. 
——, Dec., 1889, Galle’s first, no- 
tice of, xxxvill, 878; xl, 207. 
, Jan., 1840, Galle’s second, 
notice of, xl, 40, 207. 
——, March, 1840, Galle’s third, 
notice of, xl, 207. 
——, October, 1840, the third of 
1840, Bremicker’s, xl, 207. 
, of October, 1842, discovered 
by M. Laugier, xliv, 211. 
, great, of 1848, xliv, 412; 
xlv, 188f, 229. 
55 
, observations on, S. Morey,} 
, spontaneous, 111, 883 ; v, 2015) 
of 1823, 1824, observations on, | 
com 
mae great, of 1843, elements of, 
C. Walker and 'E. O. ies 
Co xlv, 188.f 
——, Enon of 1843, xlv, 230. 
——, third of 1843, xlvi, 210. 
——, De Vico’s, xlviii, 219,* 402. 
first seen in the U. 
States EL L. Smith, xlvii, 419. 
, southern, oaldecainen 1844, 
alosearailions on, xlviii, 402 ; ie 
220. 
, D’Arrest’s, Dec. 28, 1844, 
sale 403. 
iaMieiawais: s, xlix, 220. 
, second of 1845, xlix, 220. 
——, third of 1845, xlix, 220. 
——., on the observations of, P. J. 
Rodriguez, xvi, 94.f 
, nature of, W. A. Norton, 
xlvi, 104. 
——, on the vats of, x,1395 § ; XXXill, 
els 
uy W. Mitchell, xxxviii, 
35; xl, 59. 
fescue | a Of Halley’s, B. F. Jos- 
lin, xxxi, 142, 324. 
: , formation of, W. A. 
Norton, xlvi, 104.f 
, possible collision of two, J. 
J. Litirow, xxiv, 346. 
, medal for discovery of, by 
the King of Denmark, xxiii, 391. 
Commun, J. du, on the causes of 
fresh water springs, xiv, 174.! 
, hypothesis on volcanoes and 
earthquakes, xv, 12.f 
, , objections to, xv, 
25. 
—_, ——_ , strictures on, Xvi, 
ile 
Compass, mariner’s, on the inven- 
tion of, A. Humboldt, x\, 242. 
, microscopic, J. ‘Toeies xxii, 
PAB Tes 
, surveyor’s, improvements in, 
by. T. Kendall, xix, 387.£ 
pivots, on the use of native 
alloy for, xli, 67. 
* At this place, erroneously called 
Faye’s comet. 
