To show how strong the swelling force of seeds is, this bottle was filled with seeds and water and placed under water until it broke.
Hilgard, E. W. and W. J. V. Osterhout Agriculture for Schools of the Pacific Slope (New York, NY: The MacMillian Company, 1910)
1195×2974, 825.0 KiB
411×1024, 59.6 KiB
257×640, 24.5 KiB
128×320, 7.7 KiB