Name two important researches of Priestley.

(N/A) Joseph Priestley performed a series of experiments in $1770$ that revealed the essential role of air in the growth of green plants.
$1$. He demonstrated that a burning candle or a breathing mouse would soon get extinguished or die in a closed space (bell jar).
$2$. He showed that when a mint plant was placed in the same bell jar,the candle continued to burn and the mouse stayed alive,proving that plants restore to the air whatever breathing animals and burning candles remove.