Missouri, lead region of, _H. R. Schoolcraft_, iii, 248. ----, ---- ----, ores, _Troost_ and _Lesueur_, xii, 379. ----, ---- ----, _J. N. Nicollet_, xlv, 340. ----, ---- ----, _J. T. Hodge_, xliii, 35.^f ----, ---- mine of la Motte, ore not argentiferous, xliii, 64. ----, native carbonate of lead in, xii, 379. ----, cobalt ores, xii, 378. ----, cretaceous formation of, _J. N. Nicollet_, xli, 180; xlv, 153. ----, Indian mounds or fortifications in, iii, 36. ----, ---- ----, _R. C. Taylor_, xxxiv, 89. ----, contributions to the botany of, _L. C. Beck_, x, 257; xi, 167; xiv, 112. _Mitchell, E._, on the effect of quantity of matter in modifying the force of attraction, xvi, 234. ----, on the geology of the gold region of North Carolina, xvi, 1.^f ----, North Carolina, character and origin of the low country of, xiii, 336. ----, on the proximate causes of winds and storms, xix, 248.^f ----, Protogæa of _Leibnitz_, xx, 56. ----, on storms and meteorological observations, xx, 361. ----, on Welther's tube of safety, xvii, 345.^f _Mitchell, J._, on the ignis fatuus, xvi, 246. _Mitchell, J. K._, on the liquefaction and solidification of carbonic acid, xxxv, 346.^f _Mitchell, T. D._, carbonic oxide obtained free from carbonic acid, xxv, 344. _Mitchell, Wm._, on the tails of comets, xxxviii, 35; xl, 59. ----, magnetic dip at Nantucket, xlvi, 157. _Mitchill, S. L._, conditions of the growth of plants on living animals, xii, 21. ----, on the Mus bursarius or pouched rat, of Canada, iv, 183. ----, on the Proteus of the N. A. Lakes, iv, 181. ----, on a group of polyps, v, 46. ----, a new Raja, ix, 290. ----, Zeus crinitus, xi, 144.^f ----, spoonbill sturgeon, xii, 201.^f ----, new reptiles of North America, vii, 63. ----, on the eatable clam of New York, x, 287. ----, facts showing that two-headed snakes are monsters, x, 48. ----, history of sea-serpentism, xv, 351. ----, notice of his edition of Cuvier's essay on the theory of the earth, i, 68. ----, obituary notice of, xxvii, 149. _Mitscherlich_, formation of specular iron about volcanoes, xxxvi, 237. ----, on fuming nitric acid, xx, 185. _Mohs, F._, obituary notice of, xl, 220. Molasses from the potato, xxi, 93. Mole, natural history of, xvii, 386. ----, carnivorous, _S. Woodruff_, xxviii, 168. Molecules, Brown's active, xvii, 390. ----, forms and nature of crystalline, _J. D. Dana_, xxx, 275.^f Molecular attraction, _J. Henry's_ experiments on, with soap bubbles, xlviii, 215. _Moll, G._, experiments in electro-magnetism, xix, 329; xxvi, 177. Mollusca, see under ZOOLOGY. Molluskite, _G. A. Mantell_, xlv, 243.