Electrical potentials were observed for the upward entry of water into columns of air-dry mixtures of sand and kaolinite. The electrical potential difference was measured between two bright platinum electrodes, one being in the water chamber at the inlet (lower) end of a column, and the other being one of five separate electrodes placed in the sand-kaolinite at various positions along the column. Time records of electrical potential at the various electrodes, obtained with a high-resistance electrometer and a strip-chart recorder, exhibited characteristic negative peaks that could be very closely associated with the arrival of the visual wet front at the various electrodes. Thus, although the observed electrical potentials cannot be used to infer streaming potentials for the unsaturated flow process of water entry into air-dry soil, it does appear that such potentials can be used to trace quantitatively the progress of a wet front through the soil, under circumstances wherein visual observations are not possible or feasible.