Von helmont experiment on water and photosynthesis
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Photosynthesis was partially discovered in the 1600's by Jan Baptista van Helmont, a Belgian chemist, physiologist and physician. ... At the end of his experiment Helmont concluded that the growth of the tree was the result of the nutrients it had received from the water and not the soil.
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The prevailing theory at the time was that plants grew by eating soil, and van Helmont devised a clever investigation to test this idea. He weighed a willow tree and weighed dry soil. He planted the tree, watered it and then left it for 5 years. ... He concluded that the tree grew by drinking water.
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