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In the context of chronobiological research on trees, a high-sensitivity device was developed to measure low-potential electric currents along the bole of two trees growing under open conditions. Rhythmic variations of the (bio-)electric potentials are found, linked on the one hand to daily photoperiods and on the other to lunar periodicities, depending on the physiological phase of the trees.

Tree stems and tides – A new approach and elements of reflexion (reviewed paper)