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Johannes Baptista van Helmont (1579-1644)

Johannes Baptista van Helmont (1579-1644) . 5 pound willow tree Planted in 200 pounds soil 5 years later Tree was 170 pounds Predict the weight of the soil.

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Johannes Baptista van Helmont (1579-1644)

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  1. Johannes Baptista van Helmont (1579-1644) • 5 pound willow tree • Planted in 200 pounds soil • 5 years later • Tree was 170 pounds • Predict the weight of the soil.

  2. “I took an earthen vessel, in which I put 200 pounds of earth that had dried in a furnace, which I moistened with rainwater, and I implanted therein the trunk or stem of a willow tree, weighing five pounds. And at length, five years being finished, the tree spring from thence did weigh 169 pounds and about three ounces. … Lest the dust that flew about should be mingled with the earth, I covered the lip or mouth of the vessel with an iron plate covered with tin and easily passable with many holes. … I again dried the earth up in the vessel, and …”

  3. …and there was found the same 200 pounds, wanting about two ounces. Therefore, 164 pounds of wood, bark, and roots, arose out of water only.” Is his conclusion correct?

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