In following the analysis of the dream we have made some progress toward an understanding of the composition of this most marvelous and most mysterious of instruments; to be sure, we have not gone very far, but enough of a beginning has been made to allow us to advance from other so-called pathological formations further into the analysis of the unconscious.

Disease — at least that which is justly termed functional — is not due to the destruction of this apparatus, and the establishment of new splittings in its interior; it is rather to be explained dynamically through the strengthening and weakening of the components in the play of forces by which so many activities are concealed during the normal function. We have been able to show in another place how the composition of the apparatus from the two systems