itself and in being noticed by consciousness. For consciousness, which means to us a sensory organ for the reception of psychic qualities, may receive stimuli from two sources — first, from the periphery of the entire apparatus, viz.

from the perception system, and, secondly, from the pleasure and pain stimuli, which constitute the sole psychic quality produced in the transformation of energy within the apparatus. All other processes in the system, even those in the foreconscious, are devoid of any psychic quality, and are therefore not objects of consciousness inasmuch as they do not furnish pleasure or pain for perception. We shall have to assume that those liberations of pleasure and pain automatically regulate the outlet of the occupation processes. But in order to make possible more delicate functions, it was