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Show Iron Ores Formed by Bacteria. Geologists are realizing more fully as they extend their studies the magnitude mag-nitude of the work done by plants and animals in building up and tearing down parts of the crust of the earth-Even earth-Even microscopic organisms perform a large part of this work. Pasteur long ago showed us the deadly Pwr of bacteria in disease and their efficiency effi-ciency in promoting fermentation, but their influence on the fertility of soils and their work In expediting rock decay de-cay are still subjects of scientific study. |