_Mantell, G. A._, museum of, xxiii, 162^f; xxviii, 194. ----, ----, specimens from, noticed, xxviii, 197. ----, _C. Lyell's_ remarks at the presentation of the Wollaston medal to, xxviii, 391. ----, presentation of a microscope to, xliii, 206. ----, description of some fossil fruits, xlv, 401. ----, discovery of the Iguanodon, xxvii, 355.^f ----, notice of molluskite, xlv, 243. ----, on the geological age of reptiles, xxi, 359. ----, on the Unionidæ of the country of the Iguanodon, xlvii, 402.^f ----, on Zoophytes, xxxiii, 329. ----, Wonders of Geology, review of, xxxiv, 387; xxxix, 1. ----, letter to _J. Deane_, xlv, 189. ----, Medals of Creation, review of, xlviii, 105. Manufactories of Lowell, xxvii, 346. ----, limitation of the labor of children in, xii, 194. Manures, action of, _De la Giraudieu_, xxvi, 179. ----, action of gypsum in, xxvi, 181. ----, marl for, from Chesapeake Bay, xx, 411. ----, ----, from New Jersey, _J. Pierce_, vi, 237. ----, remarks on calcareous, xxx, 138, 383. ----, use of muriate of lime for, ix, 194. Map of Maryland, 1835, xxx, 393; xxxii, 191. ---- of mountains, iii, 364. Maps, on contoured, _Larcom_, xlvi, 394. ----, a mode of illustrating criminal statistics by, xxxi, 379. Mapping instrument, xx, 159. Maranta arundinacea, v, 302. Marble, Carrara, an altered oolite, xxx, 176. ----, and flagstones, strength of, _E. Hodgkinson_, xliv, 168. ----, durability of, as compared with granite, xv, 168. ----, in Massachusetts, white, iv, 40; viii, 14; xxii, 28. ----, ----, clouded, viii, 14. ----, ----, dove colored, viii, 14. ----, ----, elastic, of Lanesboro' and West Stockbridge, viii, 15. ----, ----, ---- and flexible, of Berkshire, Co., ix, 241. ----, ----, tortuous layers of, viii, 28. ---- in Vermont, xxxv, 390. ---- in Connecticut, ii, 141, 165, 219, 222. ---- ----, verd antique in Connecticut, ii, 165. ---- in New York, at Hudson, transition, vi, 371. ---- ----, in the Stonybrook Mts., v, 29. ---- ----, serpentine, v, 29. ----, Potomac breccia, xxvi, 221; xxvii, 22. ----, of Maryland, xxvii, 24, 27. ---- ----, white, of Hagerstown, v, 264; xxvi, 222. ---- in Kentucky, iii, 234. ---- in Missouri, iii, 23. ----, yellow, of Tabriz, xxxvii, 355. _Marcet, F._, influence of the moon on the weather, xxvii, 192. ----, boiling point in vessels of different materials, xlvii, 190. Mariner's compass, the invention of, _A. Humboldt_, xl, 242.