Seawater near Brighton, analysis of, _G. Schweitzer_, xxxviii, 12. ----, Black Sea, analysis of, xx, 188. ----, quantity of salt in, _C. Daubeny_, xxxvi, 188. ----, potash in, iii, 371. ----, absorption of light by, v, 134. ----, marine animals in, v, 134. ----, color of, vi, 198; xxix, 237. ----, cause of color of, xxvi, 65.^f ----, color of, due in part to iodine and bromine, xvii, 170. ----, density at different depths in the Mediterranean, xvii, 364. ----, distillation of, iii, 381. ----, distilled, use of, i, 172. ----, luminousness or phosphorescence of, v, 133; xvii, 209; xviii, 166, 187; xxxv, 372; xxxvi, 208. ----, saltness of ocean, v, 131. ----, ----, _H. Humphreys_, xlix, 208. ----, ----, at different depths, xxiii, 10. ----, specific gravity, v, 129. ----, temperature in different parts, v, 129; xxv, 130. ----, ----, at great depths, xvii, 295. ----, ----, at different depths, xxiii, 10. Seaweeds of the Atlantic, xx, 181. _Sedgwick, A._, Cambrian system of, xxxvii, 220. ----, address before the Geological Society of London, xxi, 186. ----, letter to R. Elton, xlvi, 403. Sediment from the Mersey, xxxiii, 269. _Seely, L._, garnet locality, iii, 241. Segregation theory of veins, objections to, from facts in Maine, _C. T. Jackson_, xxxvi, 148. _Seiber's_ Journey into Abyssinia, announced, iv, 383. _Selby, P. J._, notice of, xxxvii, 164. Selenite, see _Gypsum_. Selenium, a new metal, i, 310. Seleniuret of lead, xviii, 391; xix, 369. ---- ---- and mercury, xviii, 391. ---- of palladium, xix, 369. Selloa nudata, v, 300. Seminole Indians, notice of, ix, 132. Septaria, large, xxvi, 217. Serbian, or miloschin, xlii, 386. Serapis, temple of, account of the changes of level in, _C. Babbage_, xxvii, 408. Series, new algebraic, vii, 278; viii, 131; ix, 98, 293. Serpent rock of Lake Huron, iii, 258.^f Serpentine, metamorphic, through the agency of heated waters, xlv, 120. ----, crystallized, at Warwick, N. Y., ix, 242. ----, in Tenos, Grecian Archipelago, xxxi, 176. ---- of the vicinity of Hudson's Bay, xvii, 12. ----, in Canada, viii, 68. ----, in Connecticut, vi, 227. ----, in Delaware, v, 240. ----, in Maryland, xviii, 80; xxiv, 349; xxvii, 25. ----, in Massachusetts, i, 114, 137; ii, 236; iii, 238; v, 268; vi, 227; viii, 49; ix, 43; x, 213; xii, 260; xxii, 29. ----, in New Jersey, ii, 195; iv, 16; v, 29. ----, in New York, vii, 57; ix, 39, 42; xix, 225, 228; xxv, 349. ----, in Pennsylvania, viii, 237; xiv, 3, 10, 12. ----, in Rhode Island, viii, 225, 228; ix, 51. ----, in Vermont, iii, 76; v, 40, 272; vi, 227, 249; xiii, 200; xxxv, 390; (marble) xxxviii, 198. _Serres, Marcel de_, on some new bone caves, xxi, 56. _Serullas, G. S._, elected a member of the French Academy, xviii, 185. ----, on iodic acid, and morphine, xx, 184. ----, obituary notice of, xxiii, 371. Sewell Mountains, xxix, 93.