what had priestly done to introduce the mint plant without disturbing the experimental set up? howdid he light the candle from outside?
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Answer:
Priestley observed that a burning candle would get extinguished in a closed bell jar.
In August 1771, Joseph Priestley conducted another set of experiments where he placed a mint plant into a transparent closed space with a burning candle that eventually burned out the air until it soon went out.
Priestly discovered that the relit candle burned perfectly well in the air that previously would not support it.
In another experiment conducted in 1772, Priestley kept a mouse in a jar of air until it collapsed. He found that a mouse kept with a plant would survive.
After 27 days, he relit the extinguished candle again.
These kinds of observations led Priestley to offer an interesting hypothesis that plants restore to the air whatever breathing animals and burning candles remove - what was later coined by Lavoisier as "oxygen".
In these experiments, Priestly was the first to observe that plants release oxygen into the air by the process of photosynthesis
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He focused beam of sunlight with a mirror onto the candle wick and was successful in relighting the candle from outside the bell jar without disturbing the experimental setup