Chromic iron of Maryland, analysis of, H. Seybert, iv, 321.
— — from Cuba, analysis of, J. C. Booth, xxxviii, 243.
— —, remarks on, xxvii, 18, 20.
— — in Massachusetts, ii, 374.
— — in Delaware, iv, 53.
— — in Maryland, xxiv, 349, 355f; xxvii, 18, 20.
Chromium, Vauquelin's process for obtaining, xxi, 375.
—, on the combinations of, A. A. Hayes, xiv, 136.
— oxide, crystals of, xxviii, 396.
—, sulphate of oxide, M. E. Kopp, xlviii, 189.