Bridge, description of, _G. W. Long_, xviii, 123.^f ----, chain, in progress, over the Menai, an arm of the Irish sea, vi, 384. Brines, see _Salt_ and _Springs_. _Bringier, L._, geology, mineralogy, aboriginal inhabitants, &c. of the regions of the Mississippi, iii, 15. Bromine, discovery of, by _M. Balard_, xii, 198. ----, nature of, xiii, 398. ----, new compounds of, xiv, 386. ----, preparation of, xviii, 154. ----, and iodine, atomic weight of, _Berzelius_, xix, 383. ----, hydrate of, xx, 194. ----, combinations of, _C. Löwig_, xviii, 153. ----, and iodine in mineral waters, remarks on, _Prof. Daubeny_, xxi, 366. ----, and iodine in the Baltic, xix, 382. ----, in the Salina brines and Saratoga waters, xviii, 142. ----, in the Kenawha waters, xviii, 260. ----, in the Hingham salt works, Mass., xx, 161. ----, and iodine in the salt springs at Athens, Ohio, _W. W. Mather_, xlix, 211. _Brongniart, Al._, miscellaneous geological and mineralogical observations, iii, 216. ----, on the art of pottery and vitrification, new work of, xxxi, 134. ----, on organized remains, notice of, i, 71; iv, 396. ----, seven classes of rocks, xxxix, 149. ----, zoological characters of rocks, and the application of these characters to determining some strata of the chalk era, viii, 213. _Brongniart, Ad._, on the nature of the vegetables of the earth at different epochs of its formation, xxxiv, 315. Bronzing iron and gun barrels, method of, xxx, 173. Bronzite, analysis of, (Seybertite,) _T. G. Clemson_, xxiv, 171. ----, locality of, in New York, xvi, 185; xxi, 327. Brookite, xviii, 392. _Brown, S._, substance accompanying the native nitre of Kentucky, i, 146. _Brown_, production of silicon from paracyanogen, xli, 208. _Brown's_ active molecules, xvii, 390. Brown spar in Massachusetts, viii, 235; in New York, ii, 237. _Browne, J. B._, impression in marble, xix, 361.^f _Bruce, Archibald_, biographical notice of, i, 299.^f Brucite, see _Chondrodite_. Bubbles, blown in melted rosin, ii, 179. _Buckland, Prof._, Bridgewater Treatise of, noticed, _C. Lyell_, xxxiii, 112. ----, instructions for conducting geological investigations and collecting specimens, iii, 249. ----, on the vitality of toads enclosed in stone or wood, xxiii, 272. _Buckley, S. B._, botanical labors of, xlii, 12. ----, new species of plants, xlv, 170. ----, skeleton of a Zygodon, xliv, 409. _Buel, J._, excrementitious matter thrown off by plants, xxviii, 267. Buhrstone in Indiana, i, 132. ----, in Missouri, iii, 28. ----, of Ohio, xxix, 142; xxv 233. Building stone, expansion and contraction of, by variations of temperature, _W. H. C. Bartlett_, xxii, 136.^f ----, ---- in western New York, xxxvi, 45. _Burden's_ boat, introduced into France, xxx, 174. _Burgess, A._, a notice of bees, xxii, 164. _Burnett, G. T._, on the functions of vegetable life, xxi, 153.