The old physical geography taught us this much, but
it was not able to go further and tell us why it was cold or warm
independent of the seasons; it could not explain why it was at times as
warm, and even warmer, half-way to the pole than at the equator; why it
was at times very warm in the extreme northeast while very cold in
the Southern States; cold in the northwest when it was warm in the
northeast, and warm in the northwest when cold all along the upper
Atlantic seaboard; it could not forewarn us of storms. These and a
host of other facts, which the weather map makes as plain as astronomy
demonstrates that Jupiter is a planet, the new revelation, through the
instrumentality of the perfected telegraph system, makes exceedingly
plain to us if we will but seek the easily obtained information.
The principal revelations of the weather map are the facts in regard to
the areas of high and low barometer, and the influence they exert upon
the climate of the globe.
These conditions--high and low barometer--move on general lines from the
west towards the east, or towards the rising sun, and around the world
in irregular belts.
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