The electrical conductances of ethyl bromide,n-propyl bromide,n-butyl bromide, methanol, and ethanol in ultrasonic fields have been measured at frequencies between 250 kc/s and 2 Mc/s and intensities between 0.7 and 24 w/cm2. Measurements were made at room temperature, using a simple d-c. technique. It is shown that asimpletransient increase in conductance, such as has previously been observed by Seidl, may be confined to unassociated fluids and that it can occasionally give way to a much more complex—and not as yet fully understood—behavior pattern.