No coin nor oath required. For personal study only.
The heavy dust storms that originated on the Great Plains the early part of May, this year, have been the subject of much comment and undoubtedly will give the U. S. Department of Agriculture considerable concern for several years to come. All these vast expanses of alluvial soil were once covered with a closely woven mattress of grassy vegetation. The annihilation of the protective cloak of nature came as an inevitable result of attempts to place the land under cultivation or intensive grazing. With the soil exposed and returned to its original powdery state by a prolonged dry spell, a dense mass of air rushing down from the Canadian plains with increasing momentum transformed the land into whirling dust clouds which travelled east with gradual expanding force.
According to the U. S. D. A. Clip Sheet No. 83I, the dust cloud of this year was the heaviest ever experienced by the city of Washington, D.C. Measurements by the United States Weather Bureau showed that each cubic inch of air over the Capital contained I5o,ooo particles of dust. The normal dust count is 6,400. The particles were almost twice the size of those usually present and it is estimated that 5,000 tons of western real estate were constantly floating over the city during the day.
But apparently the dust was not IOO per cent. mineral matter as one might connote from the term "soil." In Science for July 6, M. H. SOULE of the Hygienic Laboratory, University of Michigan, announces that the dust-storm brought to his laboratory a liberal supply of organisms. It happened that on the day of the storm, I2O students opened an average of 5 nutrient medium plates for intervals of less than 2 minutes each. Next day practically every agar surface contained 3 to 5 glistening, raised, brownish mucoid colonies. The species was identified as B. megatherium, a common non-pathogenic spore-forming aerobic bacillus. The germ was not common to this particular laboratory and unquestionably was storm-borne. C.
๐ SIMILAR VOLUMES
They came from the West Seven fighters to the end One stunning blonde warrior Leading six hard-ass men Alexa's Travels Apocalyptic fiction An impossible quest & A Haunting new vision Long years after the war of 2012 devastated America, a
**Sue Perkins has ventured far and wide to bring you her brand new book. Pre order your copy now . . .** \_\_\_\_\_\_\_\_\_ A few years ago I was asked if I'd like to make a documentary on the Mekong River, travelling from the vast delta in Vietnam to the remote and snowy peaks of Tibet. Up unt
They came from the West Seven fighters to the end One stunning blonde warrior Leading six hard-ass men Alexa's Travels Apocalyptic fiction An impossible quest & A Haunting new vision Long years after the wa