The stuff of the dream thoughts which has been accumulated for the formation of the dream scene must be naturally fit for this application. There must be one or more common factors. The dream work proceeds like Francis Galton with his family photographs. The different elements are put one on top of the other; what is common to the composite picture stands out clearly, the opposing details cancel each other. This process of reproduction partly explains the wavering statements, of a peculiar vagueness, in so many elements of the dream. For the interpretation of dreams this rule holds good: When analysis discloses _uncertainty_ as to _either_—_or_ read _and_, taking each section of the apparent alternatives as a separate outlet for a series of impressions. When there is nothing in common between the dream thoughts, the dream work takes the trouble to create a something, in order to make a common presentation feasible in the dream. The simplest way to approximate two dream thoughts, which have as yet nothing in common, consists in making such a change in the actual expression of one idea as will meet a slight responsive recasting in the form of the other idea. The process is analogous to that of rhyme, when consonance supplies the desired common factor. A good deal of the dream work consists in the creation of those frequently very witty, but often exaggerated, digressions. These vary from the common presentation in the dream content to dream thoughts which are as varied as are the causes in form and essence which give rise to them. In the analysis of our example of a dream, I find a like case of the transformation of a thought in order that it might agree with another essentially foreign one. In following out the analysis I struck upon the thought: _I should like to have something for nothing_. But this formula is not serviceable to the dream. Hence it is replaced by another one: “I should like to enjoy something free of cost.”[1] The word “kost” (taste), with its double meaning, is appropriate to a table d’hôte; it, moreover, is in place through the special sense in the dream. At home if there is a dish which the children decline, their mother first tries gentle persuasion, with a “Just taste it.” That the dream work should unhesitatingly use the double meaning of the word is certainly remarkable; ample experience has shown, however, that the occurrence is quite usual. Footnote 1: