magnetic activity, two;
condensation, two--one the formation of cloud, and the other the formation
of fog and dew; wind, one--resembling temperature in that respect, but
embracing a much less period.

Fog forms at one barometric minimum, and cloud at another.

Fog forms at one period of the magnetic variation, cloud at another.

The formation of cloud corresponds with the greatest intensity of magnetic
action, and its associate electricities. But the oscillations of the
barometer do not correspond with either. And thus, then, we connect them:

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 i