Clypeaster, in the blue marls of N. Jersey, xvii, 287.
[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.