—, mode of preparing, xlix, 195.

—, specific gravity of, xxxv, 298.

—, on the office of, in respiration, L. C. Beck, xviii, 52.

—, reduction of metals by, xix, 371.

— in animal substances, researches relative to, Macaire and Marcet, xxiii, 384.

— — ibid, on the determination of, xxviii, 134.

— — ibid, Bunsen's method of estimating, xli, 53.

— — ibid, new method of determining, Varrentrapp and Will, xlii, 253f; xlv, 267.

—, combines with iron and copper, xxiv, 374.

—, phosphuret of, xxviii, 140.