Mandingo, native, from near the river Gambia, account of, xxxv, 305.
Manganese, separation of, from zinc, xlvii, 194; xlviii, 187.
—, commercial value of its ores, how ascertained, E. Turner, xxi, 364.
—, electricity of peroxide of, xxx, 179.
—, examination of the peroxide of, H. C. Lea, xlii, 81.
—, two sulphates of, xvi, 383.
— ores, analyses of, P. Berthier, vii, 366.
— ores, method of assaying, xxviii, 146.
— —, in Connecticut, phosphate, xiii, 196.
— ores, in Maryland, iv, 283; xxvii, 20, 33.