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He weighed a pot of soil before and after he planted a willow tree in it
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He only gave it water for five years
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The pot weighed the same afterwards but the tree was seventy-five kilograms so he concluded the plants mass came from the water and not the soil
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He was right for the most part
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He put a lit candle in a jar with a piece of a mint plant
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The candle soon went out (oxygen had not been discovered yet*) but he knew it "decomposed the air" somehow
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There was then no oxygen in the jar
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He left the plant in the jar for a while and came back later
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He took a magnifying glass and was able to light the candle through the jar, meaning somehow that there was now oxygen in the jar
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He concluded then that plants changed the composition of the air
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He measured the amount of water he gave to his plant
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He gave his plant 76,000 grams of water
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However, the plant only grew one gram
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So he concluded most of the water that was given to the plant was exhaled through its leaves
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He started out similarly to Priestly's experiment; with a lit candle and a plant in a jar
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He then put a black cloth over the jar so light could not get into the jar
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When he tried to light it later, the candle would not light
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He proved that plants need light to change the composition of the air
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He also did another experiment where he had an aquatic plant
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When there was light, the plant released little bubbles into the water
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When there was no light, the plant did not produce bubbles
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This further proved that plants need light to change the air
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Cheatography n. The art of mapping complex subjects into clear, instantly navigable reference guides.
