—, direction indicated by the ashes of volcanoes, xxv, 128; xxxiii, 53.
—, curve representing the comparative force of, almost identical with the curve of temperature, xl, 322.
—, curve of calms reverse of the curve of temperature, xl, 322.
—, monsoons, characters of, W. C. Redfield, xxv, 124.
—, —, character and causes of, W. C. Redfield, xxxiii, 63.
—, —, time of changes in the N. E. and S. W., at Canton, xxxv, 220.
—, sea and land, causes of, W. C. Redfield, xxxiii, 65.
—, trade, attributed to accumulation of air in the Gulf of Mexico, v, 355.
—, —, course and causes of, W. C. Redfield, xx, 30; xxv, 124; xxxiii, 61.
—, —, ibid, J. P. Espy, xxxix, 120, 129.