ation is because it is a product of the Unc., which
knows no other aim in its activity but the fulfillment of wishes, and
which has no other forces at its disposal but wish-feelings. If we
avail ourselves for a moment longer of the right to elaborate from the
dream interpretation such far-reaching psychological speculations, we
are in duty bound to demonstrate that we are thereby bringing the dream
into a relationship which may also comprise other psychic structures. If
there exists a system of the Unc.--or something sufficiently analogous
to it for the purpose of our discussion--the dream cannot be its sole
manifestation; every dream may be a wish-fulfillment, but there must be
other forms of abnormal wish-fulfillment beside this of dreams. Indeed,
the theory of all psychoneurotic symptoms culminates in the proposition
_that they too must be taken as wish-fulfillments of the unconscious_.
Our explanation makes the dream only the first member of a group most
important for the psychiatrist, an understanding of which means the
solution of the purely psychological part of the psychiatric problem.
But other members of this group of wish-fulfillments, _e.g._, the
hysterical symptoms, evince one essential quality which I have so far
failed to find in the dream. Thus, from the investigations frequently
referred to in this treatise, I know that the formation of an hysterical
symptom necessitates the combination of both streams of our psychic
life. The symptom is not merely the expression of a realized
unconscious wish, but it must be joined by another wish from the
foreconscious which is fulfilled by the same symptom; so that the
symptom is at least doubly determined, once by each one of the
conflicting systems. Just as in the dream, there is no limit to further
over-determination. The determination not derived from the Unc. is, as
far as I can see, invariably a stream of thought in reaction against the
unconscious wish, _e.g._, a self-punishment. Hence I may say, in
general, that _an hysterical symptom originates only where two
contrasting wish-fulfillments, having their source in different psychic
systems, are able to combine in one expression_. (Compare my latest
formulation of the origin of the hysterical symptoms in a treatise
published by the _Zeitschrift fuer Sexualwissenschaft_, by Hirschfeld and
others, 1908). Examples on this point would prove of little value, as
nothing but a complete unveiling of the complication in q