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Chapter 31 Some Foes to Fight.
You have seen moldy bread? What is, the mold? What makes it spread?
Suppose you take some pieces of moldy bread or potato and turn a glass jar or bowl over them. Catch a few flies and put them under the glass, and leave them to crawl over the moldy food. After a day, put the flies under another glass with some pieces of fresh bread or potato. If
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