—, —, —, nitrous oxide, vii, 355.
—, —, —, cyanogen, vii, 356.
—, —, —, ammonia, vii, 357.
—, —, —, muriatic acid, vii, 357.
—, —, —, chlorine, vii, 357.
—, —, Thilorier, xxxi, 163, 402, 404.
—, —, J. K. Mitchell, xxxv, 346.f
—, — of carbonic, sulphurous and chloro-chromic acid, John Torrey, xxxv, 374; xxxvi, 394.f
—, apparatus for regulating the supply of, by its absorption, xiii, 2.f
—, conducting power of liquid, xxi, 374.