the dream we may clearly distinguish the two trains of thought, of which the comforting one seems to be superficial, the reproachful one more profound. The two are diametrically opposed to each other, and their like but contrasting elements have been represented by the identical dream elements.
The mechanism of dream formation is favourable in the highest degree to only one of the logical relations. This relation is that of similarity, correspondence, contiguity, "as though," which is capable of being represented in the dream as no other can be, by the most varied expedients. The correspondences occurring in the dream, or cases of "as though," are the chief points of support for the formation of dreams, and no inconsiderable part of the dream activity consists in creating new correspondences of this sort in cases where those which are already at hand are prevented by the censor of resistance from getting into the dream. The effort towards condensation shown by the dream activity assists in the representation of the relation of similarity.
Similarity, agreement, community, are quite generally expressed in the dream by concentration into a unity, which is either already found in the dream material or is newly created. The first case may be referred to as identification, the second as composition. Identification is used where the dream is concerned with persons, composition where things are the objects of unification ; but compositions are also made from persons. Localities are often treated as persons.
Identification consists in giving representation in the dream content to only one of a number of persons who are connected by some common feature, while the second or the other persons seem to be suppressed as far as the dream is concerned. This one representative person in the dream enters into all the relations and situations which belong to itself or to the persons who are covered by it. In cases of composition, however, when this has to do with persons, there are already present in the dream image features which are characteristic of, but not common to, the persons in question, so that a new unity, a composite person, appears as the result of the union of these features. The composition itself may be brought about in various ways. Either the dream person bears the name of one of the persons to whom
