----, ---- ----, in Massachusetts, i, 115, 137, 343, 437; vi, 201, 204; viii, 57; xii, 251; xxii, 56. ----, ---- ----, in Missouri and the West, see above, under _Lead Mines_. ----, ---- ----, in New Hampshire, vi, 245; viii, 235; xxxiv, 114. ----, ---- ----, in New York, v, 21, 30; vii, 254; viii, 260; xxv, 350; xl, 76; xlvii, 417. ----, ---- ----, in Rhode Island, viii, 231. ----, ---- ----, in Tennessee, i, 63. ----, ---- ----, in Virginia, i, 63; xliii, 169. ---- pipes, strength of, xii, 189; xiv, 369. ----, ---- used as an aqueduct, hydrogen in, _N. Walkly_, xxxiv, 393. ----, ----, Ewbank's tinned, notice of, xxvi, 210. ----, ----, protected by tin, safety of, xxvi, 400. ----, and tin, combustion of the alloy of, xxi, 375. ----, pots, manufacture of, by Messrs. Dixon, xxi, 196. Leafing of plants, xliv, 419. Leather, fabrication of Russian, iv, 193. _Leavenworth, M. C._, four new plants from Alabama, vii, 61. ----, list of the rarer plants of Alabama, ix, 74. ----, description of the Tullia pycnanthemoides, xx, 343.^f ----, on some new species of plants, xlix, 127. Lebanon, Mt., coal mine of, xxviii, 32. Lederer's cabinet of minerals for sale, xxix, 392. Ledererite, supposed new mineral, _C. T. Jackson_ and _A. A. Hayes_, xxv, 78^f, 80. ----, description of, xlvii, 339, 350. Lederite, a supposed new mineral species, _C. U. Shepard_, xxxix, 357^f; xlviii, 176. ----, of Shepard identical with Sphene, xlvi, 36.^f ----, identical with Sphene, _B. Silliman, Jr.,_ xlviii, 180. ----, measurements of, by _J. D. Dana_, xlviii, 180. _Lee, C. A._, sketch of the geology and mineralogy of Salisbury, Ct., viii, 252. ----, notice of the Ancram lead mine, viii, 247. Leech, account of, x, 389; xxiv, 160. Leeches, mortality of, during storms, xvii, 186. _Leedom, E. C._, an astronomical machine, xlii, 338.^f Leghorn hats, on the cultivation of the material for, xxii, 363. Leguminous fruits, flour or meal from, vii, 189. _Leibnitz, G. W. von_, notice of life of, xlix, 187. ----, Protogæa of, or his views on the formation of the earth, xx, 56; xxxix, 15. Leipsic fair, notice of, iv, 392; vii, 381; xxiii, 182. _Leitner, E. T._, on double flowers, xxiii, 45. Lens, crystalline, of animals, how preserved for future examination, xxvi, 216. _Lenz_ on the saltness of the ocean at different depths, xxiii, 10. Lepidanche, new genus, _G. Engelmann_, xliii, 343. ----, appressa, xlv, 77. ----, compositarum, xliii, 344^f; xlv, 77. Lepidolite, analysis of, _Gmelin_, ix, 329. ----, in Maine, x, 16; xviii, 293. ----, in Massachusetts, i, 350. _Lester, W._, geological map of New London and Windham Cos., Ct., xxiii, 404.