Soils, analysis of, remarks on, _A. Eaton_, xii, 370. ----, ----, new mode of, _S. L. Dana_, xxxvi, 366. ----, ----, in _C. T. Jackson's_ geological report, xl, 189. ----, on the chemical examination of, xli, 262. ----, organic matter of, _C. T. Jackson_, xlv, 337. ----, on the importance of determining the organic constituents of, and the mode, _C. Daubeny_, xliv, 352. ----, state of iron in, xlix, 394. ----, action of manures on, _Boutigny d'Evreux_, xxvi, 179. ----, action of gypsum on, xxvi, 181. ----, effect of magnesia on, xli, 159. ----, effect of hydrated-peroxide of iron on, xli, 159. ----, effect of sulphuret of iron on, xli, 159. ----, potash in, xli, 160. ----, in Indiana, _J. T. Plummer_, xl, 198; xliv, 310. ----, of Illinois prairie, xxxiv, 160. ----, of Maryland, _J. T. Ducatel_, xxvii, 316. ----, of Massachusetts, analyses, _E. Hitchcock_, xxxvi, 363, 366. ----, of New York, Kings, Queens and Richmond Cos., xxxvi, 21. ----, of Rhode Island, _C. T. Jackson_, xl, 188. ---- of the West, analyses of, xxxvi, 373. Solar eclipse, see _Eclipse_. ---- spectrum, chemical action of, _Hessler_, xxxi, 160. ---- ----, dark lines of, rendered distinct, _D. Brewster_, xxxi, 379. ---- ----, new observations on, _J. F. W. Herschel_, xxxviii, 110. ---- ----, with light from nitre, &c., peculiarities of, _D. Brewster_, xliv, 163. ---- ----, action of gaseous and other media on, xlii, 157. ---- ----, photographic impression of, and phenomena of, _J. W. Draper_, xliv, 204. ---- ----, new experiments on, _D. Olmsted_, xlviii, 137. ---- rays, magnetic influence of, xiii, 188. ---- ----, electricity of, xvii, 391. ---- ----, see farther under _Light_. ---- spots, first observations on, xxiv, 204. ---- ----, in 1825, connection of, with temperature, xii, 199. ---- ----, in Nov., 1837, _D. Olmsted_, xxxiii, 393.^f ---- ----, heat of, _J. Henry_, xlix, 405. ---- halos, at New Lebanon, _T. Kendall_, vii, 337.^f ---- ----, in Tennessee, at Jackson, x, 368.^f ---- ----, in Massachusetts, at Millbury, x, 369.^f ---- ----, in Kentucky, xi, 325.^f ---- ----, in Rhode Island, September, 1816, xi, 328.^f ---- ----, in Otsego Co., N. Y., Feb., 1823, xx, 297. ---- ----, at Cazenovia, N. Y., _J. W. Tyler_, xxi, 189. ---- ----, at Kingston, U. C., _R. H. Bonnycastle_, xxx, 136. ---- ----, at West Point, _A. C. Twining_, xxxii, 229. ---- ----, theory of, _E. S. Snell_, xlix, 73.^f ---- heat, effect of, in raising a balloon, xxxiii, 196. ---- and terrestrial radiation, observed at Montreal, xxxvi, 182. ---- index, xlix, 301.^f ---- phosphori, xvii, 170. ---- system, on the elements of, _E. H. Burritt_, xxvi, 129. Soldering sheet iron, vii, 379. Solfatara, connection of, with Vesuvius, xix, 387. Solid bodies, instrument for measuring the expansion of, xxx, 324.^f