Salts, _T. Graham_ on the constitution of, xxxv, 300. ----, number of, xvii, 184. ----, fusibility of, xix, 379. ---- of ammonia, solvent and oxidating powers of, xviii, 255. ----, efflorescence of, prevented by the vapor of turpentine, xvi, 391. ----, haloid, certain existence of, in solution, demonstrated, _G. Wilson_, xxxviii, 118. ----, Harrodsburg, analysis of, _E. D. Smith_, i, 403. ----, metallic, on the decomposition of, _C. Matteucci_, xx, 187. ----, new series of double, formed by the action of sulphurous and nitrous acids upon the alkaline bases, _E. Fremy_, xlviii, 194. Saltness of the ocean, v, 131. ---- ----, remarks on, _H. Humphreys_, xlix, 208. ---- ----, at different depths, xxiii, 10. Saltpetre, method of making by sun's heat, discovered by _Baffi_, vi, 400. ----, formed from beat leaves, xv, 180. _Sampson, W._, notice of a cetaceous animal, xxiii, 301.^f San Lorenzo, Peru, fossils from, xxxviii, 201. Sand, blown from shore, viii, 392. ----, rate of flowing, and angle of a heap of, xix, 190. ----, pressure of, xix, 190. ----, of Lake George, iv, 46. ----, white siliceous, of Staten Island, xxxvi, 21. ----, lightning tubes in, xx, 396. Sand hills, iii, 27. Sand pipes in chalk, cause of, _C. Lyell_, xxxviii, 122. Sandstone, recent, on northern coast of Cornwall, _J. A. Paris_, i, 234. ----, new red, some account of, in United States, xli, 244. ----, ---- ----, of United States, dip due to oblique deposition, _H. D. Rogers_, xliii, 170.^f ----, new red, of Connecticut, cause of inclined position, _B. Silliman_, xlvii, 107. ----, ---- ----, of the Connecticut river, vi, 39.^f ----, ---- ----, fossil remains, including bones, in, ii, 146; vi, 43. ----, ---- ----, junction with greenstone, vi, 47. ----, or freestone of the Sugar Loaf Mountain, Maryland, xxvii, 21. ---- and breccia of the Capitol at Washington, i, 215, 216. ---- of Potsdam, N. Y., xxxvi, 25. ---- of Cornwall, England, i, 234. ----, footprints in, see _Footprints_. Sandwich Islands, rocks and minerals of, xi, 11, 362; xvi, 345. ---- ----, notices of, _C. S. Stewart_, xi, 363; xx, 229. ---- ----, Hawaii, volcanic character of, xi, 1; xx, 228. ---- ----, ----, geological features of, _E. G. Kelley_, xl, 117.^f ---- ----, ----, Mauna Loa, character of, xvi, 346. ---- ----, Oahu, features of, _J. Ball_, xxviii, 15. ---- ----, ----, remark on the structure of, _J. D. Dana_, xliv, 407. ---- ----, great agitation of the sea at, xxxvii, 358. ---- ----, see farther under _Volcano_. _Sanford, E._, notice of the calcareous tufa and tree of Chitteningo, N. Y., xviii, 354. _Sang, E._, relation between a machine and its model, xxiv, 264. ----, rapidity of motion of railway cars, xxxv, 197. Sanguinaria canadensis, xlix, 130. Sanicula marilandica, xi, 174. Santee, high hills of, iii, 2. Saponaceous vegetables, _Bussy_, xxiv, 381.