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Since it has been shown that the external polarity of the apex can be increased, decreased, inverted, or made equal to zero by an appropriate change in temperature, it becomes of importance to know how a temperature change affects the two different sets of E.M.F.s in the wood and cortex. The following experiments which bear upon these questions yield further confirmatory evidence for the existence of the two oppositely oriented E.M.F.s. They also point to the conclusion that when the temperature of the tree is changed, the pattern of the internal correlation potentials is changed. This result appears to depend fundamentally upon the general fact that equal change in temperature changes the E.M.F. unequally in different loci of the axis in polar tissues. An explanation of this unequal effect has already been presented (Lund 1, 2).

COMPARISON OF THE EFFECTS OF TEMPERATURE ON THE RADIAL AND LONGITUDINAL ELECTRIC POLARITIES IN WOOD AND CORTEX OF THE DOUGLAS FIR