Describe Priestley’s experiment.

Priestley experiment.
In the experiment
A burning candle and a mouse were kept in a bell jar. It was observed that the candle was extiguished after sometime and the mouse soon died.
When a mint plant was kept in the same bell jar, it was found that the mouse stayed alive and the candle countinued to burn. Priestley hypothesised that plants restore to the air whatever breathing animals and burning candle  used up.   Describe Priestley’s experiment.