The state of Iowa; something of its history, its institutions, its resources and natural advantages . 59. rectly from the Gulf of Mexico. The mechanics of this irrigation proc-ess may be understood quite readily. By cyclonic force, or the pow-erful suction of low area storms of a rotary character, the warm, moistwinds from the south are drawn up into tlie valley, and by dynamiccooling are made to deposit a goodly portion of their burden of mois-ture. It may be said, therefore, that this valley is watered by cyclones,which in their mechanical action and effect may be termed vast rotarypumps, an
The state of Iowa; something of its history, its institutions, its resources and natural advantages . 59. rectly from the Gulf of Mexico. The mechanics of this irrigation proc-ess may be understood quite readily. By cyclonic force, or the pow-erful suction of low area storms of a rotary character, the warm, moistwinds from the south are drawn up into tlie valley, and by dynamiccooling are made to deposit a goodly portion of their burden of mois-ture. It may be said, therefore, that this valley is watered by cyclones,which in their mechanical action and effect may be termed vast rotarypumps, and condensers of atmospheric vapors. This great central de-pression, which may be called the trough of the continent, extendingfrom the Gulf to the Arctic Sea, gives an unobstructed pathway for thewarm and moist south winds and the cool waves from the north, whichhere commingle in the atmospheric eddies, and refresh the earth withcopious showers. The heaviest annual precipitation is deposited in the region nearthe Gulf, and there the bulk of it comes in the fall, winter and earlyspring, frequently in
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectlouisia, bookyear1904
