Root Pressure

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“Apparatus to measure root-pressure. T, large tube fastened to the stump of the dahlia stem by a rubber tube; rr, rubber stoppers; t, bent tube containing mercury; ll’, upper and lower level of mercury in T.” -Bergen, 1896


Joseph Y. Bergen, A. M. Elements of Botany (Boston, MA: Ginn & Company, 1896)


TIFF (full resolution)

1329×2400, 484.0 KiB

Large GIF

567×1024, 83.6 KiB

Medium GIF

354×640, 43.1 KiB

Small GIF

177×320, 14.1 KiB