The lungs
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“The lungs fill up most of the cavity of the chest. One lies on either side of the heart which is in the middle of the chest. The lungs in animals are called lights because they are spongy sacs and so light as to float when thrown into water.” —Davison, 1910
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Human Lower Respiratory SystemSource
Alvin Davison, Health Lessons (New York: American Book Company, 1910) 97
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