—, —, in Maryland, xviii, 81.
—, —, in Canada, viii, 75.
—, micaceous, in Vermont, iii, 76; vi, 208, 233.
—, —, in Massachusetts, i, 115; iv, 53; vi, 27, 207, 233, 248; xxii, 53.
—, —, in Rhode Island, viii, 231, 232.
—, —, in New York, xxv, 350.
—, —, in Pennsylvania, iv, 4; viii, 238.
—, —, in Virginia, iii, 232.
—, phosphate of, Cornwall, analysis of, vii, 369.
— pyrites, cause of decomposition of, xix, 387.