ONE of the basic problems in the study of bulk conductivity phenomena (dark- and photo-conductivity) in organic crystals is the apparent energy deficit in the difference between the ionization energy of the molecule in the crystal and the energy supplied by the exciting radiation. An excellent review of this problem is given by Garrett¹. All current efforts to resolve this difficulty have been concerned with the energy balances within the crystal, excluding the electrodes, with the goal of explaining how a charge separation is produced inside the crystal.