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Show AIR MASSES CAUSE J DROUTHS. j Most of our readers are fam'liar with the new "air mass" forecasting now being used by the weather bureau. bu-reau. The theory is that huge masses mass-es of air, sometimes two or three 1 miles thick, and often a third of the size of the United States, travel about and create our weather. Recently G. R. Parkingston, meter-ologist meter-ologist of a large afr line, explained the dust storms of the midwest by the behavior of two great air masses, one from the north Pacific and the other from northern Canada and Alaska. A shifting of the normal currents cur-rents of these masses and the moist tropical air from the Gulf of Mexico stirred up the dust storms. TTris theory may or may not be entirely en-tirely accurate, but it as least illustrates illus-trates the advance that is being made in the study of nature and its effect upon man. A decade or so ago few citizens gave any thought to the stratosphere, much less to the air masses beneath it. As time goes on and the mind of man makes pro- j gress, human be'ngs will learn many things, and some day, in the far distant dis-tant future, may understand nature. |