—, prepared from the sulphate of soda, xiii, 176.
—, impurities in, xix, 83.
—, carbonate of, on the manufacture, xxviii, 143.
—, supercarbonate of, new mode of preparing, xxx, 189.
—, —, xix, 198.
—, nitrate of, in Atacama, Peru, xii, 385.
—, —, in Tarapaca, xxxviii, 410; xxxix, 375; xliv, 5.
—, anhydrous sulphate of, xiii, 185.
—, hyposulphite of, Plessy, xlix, 200.
— and magnesia sulphate, xlviii, 189.