determined, probably experiences a new elaboration until it comes to conscious perception; and, secondly, from the interior of the apparatus itself, the quantitative processes of which are perceived as a qualitative series of pleasure and pain as soon as they have undergone certain changes.

The philosophers, who have learned that correct and highly complicated thought structures are possible even without the coöperation of consciousness, have found it difficult to attribute any function to consciousness; it has appeared to them a superfluous mirroring of the perfected psychic process. The analogy of our Cons. system with the systems of perception relieves us of this embarrassment. We see that perception through our sensory organs results in directing the occupation of attention to those paths on which the incoming