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<p>Book digitized by Google from the library of Harvard University and uploaded to the Internet Archive by user tpb.
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<br>Subjects: water; heat; air; food; bacteria; plants; substances; starch; soil; light; carbon dioxide; running water; coloring matter; ground water; north pole; fresh air; electric current; mineral matter; chemical action; boiling water</div>
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Bertha May Clark</div>
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