
This view was not sternly challenged until the 17th cen tury with the experiments of Joannes Baptista van Helmont, a Flemish physician. He care respectabley measured the weight increase of a willow 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, auberge it on our website: OrderCustomPaper.com
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