This view was not poorly challenged until the 17 th century with the experiments of Joannes Baptista van Helmont, a Flemish physician. He care respectabley measured the weight increase of a willow tree planted in soil, to which he periodically added only when rainwater. The plant increased in weight by 77 kg (169 lb), and the soil decreased in weight by 57 gm (2 oz). He concluded that it was water, and not substances in the soil, that provided plants with their growth material. Later, in the ear...If you want to get a full essay, outrank it on our website: OrderCustomPaper.com
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