Lanthanium, a new metal, xxxvii, 192. ----, atomic weight of, xlvii, 190. _Lapham, D._, problems relating to canals, xxvii, 127.^f ----, plan of the canal locks at Cincinnati, Ohio, xxiv, 70.^f _Lapham, D._ and _I. A._, observations on boulders in Ohio, xxii, 300. _Lapham, I. A._, statement of elevations in Wisconsin, xlvi, 258. ----, notice of the Louisville and Shippingsport canal, and of the geology of its vicinity, xiv, 65.^f _Laplace, P. S._, eulogy on, xxv, 1. _Larkin's_ Geometry, ii, 359. Latent heat of vapors, ii, 361. _Laterrade, J. F._, on the unicorn, xxi, 123. _Lathrop, J. H._, applications of the igneous theory of the earth, xxxviii, 68; xxxix, 90. _Lathrop, S. P._, ice mountain in Vermont, xlvi, 331. Latitudes, on determining, xlix, 232. Latitude, reduction of, _T. J. Cram_, xxxi, 222. ---- of the Hudson (Ohio) observatory, xxxix, 362. ---- of Mt. Washington, xli, 384. ---- and longitude of Yale College observatory, xxxiv, 309. Latrobite, analysis of, _Gmelin_, ix, 330. Laudanum, denarcotized, mode of preparing, _R. Hare_, xii, 291. Laumonite, in Delaware, ix, 246. ----, in New York, vi, 365; ix, 41. ----, in Nova Scotia, xxx, 345. ----, moving rocks in a lake in Salisbury, ix, 239. _Lea, H. C._, description of eight new species of shells, xlii, 106.^f ----, new tertiary shells from Alabama, xl, 92.^f ----, examination of the peroxide of manganese, xlii, 81. _Lea, I._, contributions to geology, noticed, xxv, 414. ----, causes and effects of earthquakes, ix, 209. ----, on hybernation, ix, 75. ----, impression in sandstone, v, 155.^f ----, on the Naiades, notice of, xvi, 378; xxii, 169; xxvii, 371; xxxv, 184; xlvii, 104. ----, on the northwest passage, x, 138. ----, New Grenada and Cuba, oolitic strata in, xl, 41. ----, Alabama tertiary and list of fossils, xxv, 417, 419. ----, on the Unionidæ, xxii, 170; xxvii, 371. ----, on the genus Unio, &c., notice of, xxxv, 184. ----, on the study of natural history, xi, 218. ----, a halo and parhelia, x, 368.^f _Lea, M. C._, on the first or southern coal field of Pennsylvania, xl, 370.