The effect of an external electric field on the physical appearance of the Pd/D electrode in an operating cell is discussed. It is shown that the individual globules of t h e " c a u l i f l o we r-l i k e " s t r u c t u r e u n d e r g o a s h a p e c h a n g e e x h i b i t i n g t wo d i s t i n c t features, viz those that require energy expenditure that can be extracted from the applied external field (eg reorientation , separation of individual globules, dendrite formation) and those that require energy expenditure far in excess of one that can be supplied by the electric field alone (eg exhibiting features usually associated with the solidification of a molten metal under liquid or the presence of localized catastrophic events leading to the formation of craters). It is shown, by energydispersive X-ray method, that the needed energy is provided by nuclear events occurring in the region close to the electrode surface. The nuclear events are of the type: precursor unstable nucleus stable nucleus. 1.0 Introductory remarks Apart from an excess enthalpy generation, there are other reported manifestations of unusual activities in the negatively polarised Pd/D-D 2 O system[1]. Among them (i) changes in surface morphology far greater than those associated with the lattice expansion[2] and (ii) accumulation of impurities in the surface (sub-surface) region that exceeds the amounts that can be transferred from the cell components during prolonged cell operation[3]. In what follows, we shall demonstrate that both these features are magnified if an operating cell is placed in an external electrostatic field.