—, heating of, E. Emmons, xviii, 371.
—, impurities of, how precipitated, xxviii, 150.
—, —, in rain, xv, 185.
—, medicinal, on the preparation of, W. Meade, xxii, 126, 330.
—, mineral, see [Springs.]
—, oxygenized, iii, 369.
—, —, preparation by L. J. Thenard, xxiii, 382.
—, pressure of, at great depths, L. Vanuxem, xiv, 194.
—, purification of, xxviii, 150.
—, rain, nitric acid in, xv, 181.