Coal, analyses of, _W. R. Johnson_, xxxviii, 382; xxxix, 139; xlix, 169. ----, ----, of Maryland, _Ducatel_ and _Alexander_, xxvii, 31. ----, ----, of Virginia, Chesterfield, _B. Silliman_ and _O. P. Hubbard_, xlii, 369. ----, ----, of Pennsylvania, Tioga Co., _W. Meade_, xiii, 32. ----, ----, indicating iodine, _M. Bussy_, xl, 217. ----, passage of anthracite into bituminous, _M. C. Lea_, xl, 370. ----, cannel, xviii, 376; xxix, 39; xxxi, 79. ----, economical uses of anthracite, x, 331; xi, 78. ----, ---- ---- ---- in smelting iron, xxxiii, 266. ----, ---- ---- ---- in blacksmith's shops, _G. Jones_, xviii, 303. ----, ---- ---- ---- when first used in blacksmithing, xviii, 307. ----, in the arts, heating power of, _W. R. Johnson_, xlvii, 126; xlix, 166. ----, ----, consumption of, in steam engines, xxix, 351. ----, ----, comparative value of American, for steam navigation, _W. R. Johnson_, xlix, 310. ----, ----, amount consumed at Pittsburg, xxix, 79. ----, ----, comparative character of European and American anthracites, _W. Meade_, xii, 75. ----, fossils, vegetable, _A. Brongniart_, iv, 266^f; analysis of the works of _Ad. Brongniart_ on, vii, 178. ---- ----, ----, _H. Witham_, xviii, 110.^f ---- ----, ----, in England, iii, 389. ---- ----, ----, at Wilkesbarre, Pa., ix, 165. ---- ----, upright trees, Nova Scotia, _C. Lyell_, xlv, 353. ---- ----, Ohio valley, _S. P. Hildreth_, xxix, 1, 151.^f ---- ----, marine shells, England, xxv, 199. ---- ----, freshwater shells, Lancashire, England, xxxiv, 26. ----, origin of, xii, 87; xviii, 321. ----, ----, anthracite, xxiv, 172. ----, ----, bituminous, xvii, 397. ----, period, probable constitution of the atmosphere during, _H. D. Rogers_, xlvii, 105. ----, peat converted into, xxxiv, 395. ----, specific gravities and combustible qualities of Ohio coals, _S. P. Hildreth_, xxix, 147. _Coal Mines and Formations, characters and localities of._