—, heights of various points in, C. Whittlesey, xlv, 12.
—, meteorological observations in, see under [Meteorology.]
[Oils,] depuration of, xxiv, 200.
—, action of, on oxygen gas, xxiii, 190.
—, bleaching, xlvii, 196.
—, proportion of, in different oleaginous plants, xviii, 150.
— of balsam copaiva, xxviii, 384.
Oil of cajeput, xxviii, 384.
— of the Chené, ii, 264.
— of cinnamon, xxviii, 385,