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

Source

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

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