— hydrate of silica. Harford Co., Md., P. T. Tyson, xviii, 79.
— — — identity of, with Deweylite, C. U. Shepard, xviii, 81.
— pseudomorphs, and metamorphic changes, xlviii, 89.
Magnesite, hard, from Baumgarten, Silesia, vii, 368.
—, in N. York, v, 267; xlvi, 34.
—, in Maryland, xiv, 12.
—, in Pennsylvania, xiv, 9, 10.
Magnesium, notice of, xix, 197, 379; xxvii, 196.
—, obtained by W. W. Mather, xx, 408.
[Magnets,] cast iron, xxxiii, 265.