Marl, apparatus for analyzing, _W. B. Rogers_, xxvii, 299.^f ---- from Farmington, Ct., analysis of, _E. Hitchcock_, xxxvi, 176. ---- in New York, iii, 237. ---- for manure, from near the Chesapeake Bay, xx, 411. ---- of New Jersey, identical with the chalk of England, _S. G. Morton_, xxii, 90. ---- ---- ----, analysis of, xvii, 277. ---- ---- ----, on the application of, to agriculture, _J. Pierce_, vi, 237. ----, shell, in Maryland, xxvii, 3. ---- beds of Virginia, xi, 54. ---- pits, in N. Carolina, organic remains of, _H. B. Croom_, xxvii, 168. ---- from Ashley river, S. C., composition of, _J. L. Smith_, xlviii, 101. ---- ---- ---- infusorial character of, _J. W. Bailey_, xlviii, 102. ---- in Wayne Co., Ohio, xxxi, 55. ----, red calcareous, in Texas, _J. L. Riddell_, xxxvii, 211. Marmalite, description and analysis of, _T. Nuttall_, iv, 17, 19. _Marsh, R._, meteorological register, xlix, 212. Marsupial fossils of the Stonesfield slate, xxvii, 412; xxxvii, 228. ---- ----, see under _Zoology_. Martha's Vineyard, notices of geology of, vii, 240.^f ---- ----, ibid, _C. Lyell_, xlvi, 318. _Martin, A. St._, account of the opening into his stomach, and experiments on the gastric juice of, _W. Beaumont_, xxvi, 194. _Martin, J._, on the central forces of bodies revolving about fixed axes, xxxix, 262.^f _Martius, C. F. P. von_, on the spiritual life of plants, xl, 170. ----, works of, noticed, xlv, 217; xlviii, 207. Maryland, Bare Hills, near Baltimore, _H. H. Hayden_, xxiv, 349.^f ----, minerals of, _G. W. Carpenter_, xiv, 1. ----, ---- of Baltimore and Harford Cos., _P. T. Tyson_, xviii, 78. ----, chromic iron of, iv, 321; xxiv, 349, 355; xxvii, 18, 20. ----, Appalachian chain in, _W. E. A. Aikin_, xxvi, 219.^f ----, notice of the Geological Report and Map of, _J. T. Ducatel_ and _J. H. Alexander_, xxvii, 1; xxx, 393; xxxii, 191. ----, Mastodon longirostris in, xliii, 143. ----, caves in, containing saltpetre, xxvii, 33. ----, coal in, _J. T. Ducatel_ and _J. H. Alexander_, xxvii, 29. ----, ----, chemical analysis of, ibid, xxvii, 31. ----, tertiary fossils of, _I. Lea_, xxv, 422. ----, infusoria in, xlvi, 137^f; xlviii, 201, 330.^f _Mason, E. P._, micrometric measures of eclipse of the sun, Sept. 1838, xxxv, 174. ----, on some nebulæ, xl, 37. ----, obituary notice of, xl, 407; xliii, 381. _Mason, O._, chemical examination of the bark of the white birch, xx, 282. Masonite, description and analysis of, _C. T. Jackson_, xl, 186. ----, composition of, xlviii, 218.