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SoS cm 
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—Sap pressure curves for maples and birches April 18, 1904: A, near the base of a 12-inch maple; B, 157°™ above A; C, the 
Ma anit D, 180c from the base of 7-inch black birch; F, 135° below D; E shows where the pressure curve of D would 
have been if there had been exact hydrostatic equilibrium within the tree; G, curve for a 10° maple; the responses of pressure to sun- 
shine and cloud are to be noted 
[6061 
ftv HONId AHL NI AMASSAAd dVS—NOAT GNV NIMYIW 
