Journal of the Franklin Institute, Vol. 192: Devoted to Science and the Mechanic Arts; July-December, 1921 (Classic Reprint) - Softcover

Inhaltsangabe

Excerpt from Journal of the Franklin Institute, Vol. 192: Devoted to Science and the Mechanic Arts; July-December, 1921

I took an earthen vessel in which I put 200 pounds Of soil dried in an oven then I moistened with rain water and pressed hard into it a shoot of willow weighing 5 pounds. After exactly five years the tree that had grown up weighed 169 pounds and about 3 ounces. But the vessel had never received anything but rain water or distilled water to moisten the soil when this was necessary, and it remained full Of soil which was still tightly packed, and, lest any dust from outside should get into the soil, it was covered with a sheet Of iron coated with tin, but perforated with many holes. I did not take the weight of the leaves that fell in the autumn. In the end I dried the soil once more and got the same 200 pounds that I started with, less about two ounces. Therefore the 164 pounds of wood, bark, and root arose from the water alone.

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