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Show Cause of Earth's Fragrance. The real cause of the peculiar fra-grancg fra-grancg of the earth, which Is noticeable notice-able especially In the uprlng and nftcr rains, has liven found by recent experimenters. ex-perimenters. It ws fonircrly explained ex-plained as a result of certain chemical decompositions, but has now been 7 is-covered is-covered to ke the emanation of thread bacteria, of which two species are particularly par-ticularly odorous. Not only do thu bacteria Isolated from the soil have thn earth fragrance, but they retain it when cultivated on very varied sub stances, even on such iuorgun lc materials mater-ials as pe;i soup, milk, glycerine and starch paste. |