Biology Compulsory in the Chinese version 1 Section 3 "Capture of Light Energy" A Belgian doctor named Helmont conducted such an interesting experiment in the early 17th century. He planted a section of willow branches that could easily take root and survive in a large tile basin. Before planting, he weighed the mass of willow branches (2.27kg) and the mass of dry sand in the tile basin (90.8kg). After that, only rain water was poured into the basin, and no other things were added. Five years later, when Helmont weighed again, the willow branches had grown into a willow tree weighing 76.86 kg, and the quality of the dry sand in the tile basin was only reduced by about one thousandth. The increased mass of willow is much greater than the decreased mass of soil. Therefore, according to this experiment, Helmont believes that the substance that will grow the willow tree and increase its quality comes mainly from rain, not from the soil.
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