Level of the Dead Sea, barometrical observations made to determine, xlii, 214. ----, difference of, between the Black and Caspian Seas, xl, 320. ----, change of, during earthquakes in Calabria, Chile, Scandinavia, Finland, &c., _G. Bischof_, xxxvi, 273. ----, ----, various examples of, _W. W. Mather_, xlix, 294. ----, ----, in Chile, xxviii, 236. ----, ----, ----, and elsewhere in S. America, _C. Darwin_, xxxiii, 100. ----, ----, at Ceylon, vi, 194. ----, ----, in Great Britain, xxxiii, 97; xxxiv, 27. ----, ----, about the North American Lakes, _C. Lyell_, xlvi, 314. ----, ----, about Lake Huron, indicated by ancient beaches, iii, 257. ----, ----, about Lake Ontario, ibid, _G. E. Hayes_, xxxv, 104. ----, ----, in Maine, _C. T. Jackson_, xxxvi, 154. ----, ----, in New York, about Canaan mountain, v, 15. ----, ----, ----, in the Mohawk valley, xxxvi, 31. ----, ----, in Palestine, _J. D. Sherwood_, xlviii, 15. ----, ----, on the Scandinavian coast, _L. Beamish_, xlvii, 184. ----, ----, in Sweden, _C. Lyell_, xxviii, 72, 387. ----, ----, in United States and California during the tertiary epoch, _T. A. Conrad_, xxxv, 245. ----, causes of changes of, _G. Bischof,_ xxxvi, 278. ----, ---- ibid, _W. W. Mather_, xlix, 284. ----, ---- ibid, _H. D._ and _W. B. Rogers_, xliv, 360. _Lewis, J. A._, Kenawha gas, xlix, 209. _Lewis, W. J._, involution of polynomials, xlii, 239. Lexicography, contributions to English, _J. W. Gibbs_, xxxiii, 324; xli, 28, 32; xlv, 96. Leyden jar, effect of freezing water in, viii, 374. ---- ----, on the discharge of, xxxviii, 6. _Lezch, J. U._, volatile acids of butter, xlix, 202. Lias of the west, _S. P. Hildreth_, xxx, 395. Liatris flexuosa, xxxvii, 388.^f ---- fruticosa, v, 299. ---- oppositifolia, v, 299. ---- scariosa, iv, 67. ---- squarrosa, iv, 66. Library, Royal, at Paris, size of, viii, 376. ---- of Yale College, donation to, from England, xxvii, 184. Libraries of the world, comparative table of, xxxi, 178. ----, circulating, in England, v, 175. ---- of St. Petersburg, v, 177. Lichen rocella, coloring matter of, xviii, 151. _Liebig, J._, on creosote, xxviii, 131. ---- and _Wöhler_, on the radical of benzoic acid, xxvi, 261.^f ----, on bitter almond oil, xxvi, 263. Life, on the functions of vegetable, _G. T. Burnett_, xxi, 153. ----, mean term of, among the Romans, xvii, 188. ----, mean term of, in France and England, xvii, 188. ----, probability of, from registers kept at Geneva, xv, 187. ---- of a molluscous animal, singular preservation of, xxviii, 355. ---- apparatus, notice of _Murray's_, xxviii, 70. ---- preservers, xiv, 189.