_Shortrede, R._, logarithmic tables of, noticed, xlviii, 208.
Shower of red matter like blood in Tennessee, a hoax, xliv, 216, (see xli, 403.)
Siamese twins, an account of, _J. C. Warren_, xvii, 212.^f
_Sibbald, R._, notice of, with an enumeration of his works, xxxvii, 138.
Siberia, steppes, xvii, 23. ----, depth of the frozen ground in, xxxvi, 210. ----, temperature of the ground in, xxxvi, 205. ----, notice of Humboldt's expedition to, xvii, 405.
_Sibley, J._, fact from a letter by, relating to the Texas meteoric iron, viii, 221.
Sicily, earthquakes of 1823, ix, 216. ----, geological structure of, _F. Ferrara_, viii, 201. ----, marbles of, viii, 203. ----, minerals of, viii, 203. ----, geology of, _C. Daubeny_, x, 230.^f ----, volcanic character of, xiii, 272. ----, fountain of Cyana in, xxvii, 82.
Sida abutilon, affording a material for cordage, xxi, 37.
Sidero-graphite, _J. Torrey_, ii, 176, 370.
_Siebold's_ Flora Japonica, noticed, xxxix, 175.
Sigillaria, generic characters, vii, 180. ---- marineria, xxxi, 30.^f ---- in the coal fields near Liverpool, xlv, 403. ----, remarks on the relation of, to Stigmariæ, xlix, 227.
Signals, iii, 382. ----, telegraphic, by rockets, v, 189.
Signs, observations on the language of, viii, 348.
Silene axillaris, vii, 62. ---- regia, xi, 182.
Silex, fusion of, ii, 292. ----, solubility of, xiv, 385; xli, 60. ----, gelatinous, _Guillemin_, xiv, 391. ----, in solution, in geodes, viii, 282. ----, ----, ibid, _G. Bischof_, xlix, 396. ----, hydrate of, xv, 390. ---- in plants, xxxiv, 27.
Siliceous buhr millstone deposits of Ohio, xxix, 142. ---- ----, hot water origin, xxix, 45. ---- minerals, on the treatment of, by carbonated alkalies, xviii, 404. ---- ----, solution of, by steam, xlviii, 397. ---- glass from burning hay, xix, 395; xxiv, 174. ---- corals, i, 141. ---- shells, corals and wood of Antigua, _S. Hovey_, xxxv, 79; --due to siliceous solutions, 82. ---- Sinter of the Azores, _J. W. Webster_, iii, 391. ---- springs and deposits in India, _Newbold_, xlix, 398. ---- substances, porosity of, vii, 192. ---- ----, containing siliceous infusoria and minute organic remains, _Turpin_, xxxii, 400.
Silicic acid, see _Silex_. ---- ether, _Ebelman_, xlix, 192.