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A tumbler containing a piece of potato. It is covered with cotton. This is used to grow bacteria.


Hilgard, E. W. and W. J. V. Osterhout Agriculture for Schools of the Pacific Slope (New York, NY: The MacMillian Company, 1910)


TIFF (full resolution)

2476×2946, 755.1 KiB

Large GIF

860×1024, 128.5 KiB

Medium GIF

537×640, 68.4 KiB

Small GIF

268×320, 25.1 KiB