CAUSE. | EFFECT. | EFFECT. | | Increase of magnetic|Decrease of pressure. |Increase of primary or magneto-electric | |condensation. activity, as shown |Of positive electric | by declination and |tension. |Of wind. increase of | | horizontal and |Of surface condensation,|Of electrical disturbance vertical force. |_i. e._, fog and dew. |and phenomena in the | |trade and its vicinity. This connection is equally obvious if the order is reversed--thus; CAUSE. | EFFECT. | EFFECT. | | Decrease of magnetic|Increase of pressure. |Disappearance of primary or magneto-electric | |condensation. activity. |Of tension of | |atmospheric electricity.|Of wind, and | | |Of surface condensation,|Of electric disturbance |_i. e._, fog and dew. |in the trade and its | |vicinity. If we examine still more particularly the different phenomena, we shall find the same relative action of the forces carried into all the atmospheric conditions, however violent. 1. The barometer falls when horizontal magnetic force, and a tendency to cloud and wind, increase; and rises when they decrease. This corresponds with the character of the irregular barometric oscillation. Barometric depressions accompany clouds and winds, and are in proportion to them, and are all greatest where magnetic force is greatest. The barometer also rises as the magnetic energy decreases. Do the magnetic currents, passing upward with increased force, lift, elevate the atmosphere? How, then, are we to explain the increased range of the oscillations, as the center of atmospheric machinery is reached, where magnetism has least intensity, and the perpendicular currents are less, and attraction is less? Attraction is greatest where intensity is greatest, and there the barometer stands highest, and the diurnal range is least. Is it then the attraction of magnetism which produces the barometric oscillations? If so, how then can we explain the diurnal fall while magnetism is most active?