What we call the wind is mediately the air moving but causatively, and immediately, and more profoundly, it is the action of the vito-magnetic fluid. _It is therefore a purely magnetic phenomenon. In the interplay of that subtle, all-pervasive fluid, is found the key to the theory of the winds._ Hurricanes, cyclones, tornadoes, zephyrs, etc., are manifestations of its operations. These phenomena imply the existence of a force at times stupendous, and at times so gentle as simply to move a leaflet. This power in full magnitude may spring instantaneously into action; and it may, too, as instantaneously cease. It may suddenly drive a body of air at the rate of one hundred miles per hour, and as suddenly arrest its progress. The air having no inherent propulsive powers, that originate and control its directions, velocities, and varied forms of movement, is yet subject to definite laws. What these laws are has never been divulged.--"The wind bloweth where it listeth." Yet in viewing earth and atmosphere as vast reservoirs of vito-magnetic fluid, shifting back and forth to maintain an equilibrium, we believe we see the workings of the very force which moves and sways the atmosphere; which causes its currents, both general and special; and which gives rise to all its more extraordinary and unaccountable phenomena. _What gives rise to the Currents._ The changes in the magnetism of the earth and atmosphere give rise to these currents. They are developed in various forms. The following may be mentioned as the most important. 1st. The general and widespread perturbations, occurring within the body of the earth, and implicating immense areas, even whole continents. 2d. The interruptions of continuity of the _solar currents_ as in the phenomena called sun-spots. These changes, to whatever cause due, are capable of disturbing the terrestrial magnetic equilibrium over varying areas, and of working instantaneously. 3d. The effects of the interruptions of the sun's rays through the medium of clouds. 4th. Purely local vito-magnetic, or electrical, actions occupying smaller or larger areas.[13] That the origination, suspension, and continuation of these movements, in all their forms are due to purely vito-magnetic force, we think demonstrable. Thus, no other can act so instantaneously, none with such varied exhibitions of power, and none so widespread in their development. In the movement of a body of air, the space previously occupied by that body must be resupplied by another of equal volume. This resupply may not necessarily be derived from the circumambient atmosphere as heretofore supposed. In some instances the resupply is derived _in but slight degree_ from that source, but rather from that great reservoir, the earth; as in the instances of whirlwinds and tornadoes. _Philosophical Considerations drawn from Observation._