Sewers, furnace for ventilating, vii, 177. ----, cleansing of, xviii, 161. Sexes, proportion of, viii, 376. _Seybert, A._, notice of, i, 37. _Seybert, H._, analysis of the chrysoberyl, of Haddam, Ct., viii, 105. ----, ---- of bog iron ore from New Jersey, viii, 298. ----, ---- of the Maclureite, v, 336. ----, ---- of the melanite of Franklin furnace, N. Jersey, viii, 300. ----, ---- of pyroxene from the Franklin iron-works, vii, 145. ----, ---- of sulphuret of molybdenum, iv, 320. ----, ---- of chromic iron, iv, 321. ----, ---- of a manganesian garnet, vi, 155. ----, ---- of the glassy actinolite of Concord, Penn., vi, 331. ----, ---- of tabular spar, pyroxene and colophonite, from Willsboro', N. Y., v, 113. ----, reclamation of the discovery of fluoric acid in chondrodite, vi, 168, 356. ----, analysis of a meteorite, xvii, 326. Seybertite, a new mineral, _T. G. Clemson_, xxiv, 171. Seyssel cement, xxxiv, 383. Shad-fisheries of the Delaware, notice of, _S. Howell_, xxxii, 134. Shaquaw, Cherokee, prophecy of, iii, 39. Shark, fossil, xvii, 289. ----, see farther under _Zoology_. Sharpening of razors and other cutting instruments, method of, xxi, 165. _Sharpless, J. T._, description of the American wild swan, xxii, 83.^f Sheathing of ships, _H. Davy's_ experiments on, xvii, 244. ---- for ships, of leather, xv, 365. Sheep, relative value of different kinds of food for, xxiii, 393. ----, merino, price of, in France, v, 189. _Sheffey, H. W._, ice at the bottom of a river, xxxvi, 186. Shelburne Falls, Mass., vii, 16. _Sheldon, W._, on tanning, &c., i, 312. Shells, analyses of, _W. B. Rogers_, xxvi, 361. ----, fancy work from, xxxii, 257. ----, as a circulating medium, xxxii, 258. ----, recent and fossil, see under _Zoology_. Shell fish in Ohio, disease among, _S. P. Hildreth_, xxxii, 97. ---- rock, of the Florida coast, ix, 123. ---- ---- of St. Augustine, remarks on, xxxv, 61. ---- ---- of St. Croix, xxxv, 71.