A detailed study of the pseudostationary mercury electrode is presented, based on its use in LSV. Delay times (t(1)) as short as 20 ms can be employed; the drop area is still given by its classical expression, and minimization of the ohmic drop allows sweep rates of a few thousands of volts per second to be used. The conditions for pseudostationarity are given; the lower sweep rates utilizable are of the order of few tenths of volt per second. Reactant adsorption is considered, and zones where rehomogenization near the electrode surface is practically either 100 or 0% are defined in a plane log t(1)/log b(o) (b(o) is the adsorption coefficient); the diffusional or surface character of the current is studied. Influence of the drop growth and sphericity is examined.