Thousands Of Tons Of Dust

Accovüing to the estimates of Mr. J. A. Ud'len, wlio luis stnffied tlie remarkablo phenomena of dust and sand storms ín the arid regious of the w.; , overy cibi ■ mile of Uic lewer air during au unlinary "dry .storm" contains at least 2'J5 '.ons of dunt, while in srverfi Btonus of this kind as much as 126,000 tons of lust and sand laay be containcd in a oubic. inile of air. Dust storms sometimos last for twenty or thirty liours.