the conscious perception only as the particular activity of an independent system for which the abbreviated designation “Cons.” commends itself. This system we conceive to be similar in its mechanical characteristics to the perception system P, hence excitable by qualities and incapable of retaining the trace of changes, i.e. it is devoid of memory. The psychic apparatus which, with the sensory organs of the P-system, is turned to the outer world, is itself the outer world for the sensory organ of Cons.; the teleological justification of which rests on this relationship. We are here once more confronted with the principle of the succession of instances which seems to dominate the structure of the apparatus. The material under excitement flows to the Cons, sensory organ from two sides, firstly from the P-system whose excitement, qualitatively