In august of 1771, Joseph Priestley put a small brunch of min into a transparent closed space with a candle that burned out the air until it soon went out. After 27 days, he lit the extinguished candle again and it burned perfectly well in the air that previously would not support it. So Priestley proved that plants somehow change the composition of the air. In another celebrated experiment from 1772, Priestley kept a mouse in a jar of air until it collapsed. He found that a mouse kept with a plant would survive. These kinds of observations led Priestley to offer interesting theory that plants restore to the air whatever breathing animals and burning candles remove --- what was letter coin by Lavoisier oxygen.
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