resultant in the parallelogram of forces to its components.

In one of my dreams, for instance, there is talk of an injection with propyl. On first analysis I discovered an indifferent but true incident where amyl played a part as the excitant of the dream. I cannot yet vindicate the exchange of amyl for propyl. To the round of ideas of the same dream, however, there belongs the recollection of my first visit to Munich, when the Propyl�a struck me. The attendant circumstances of the analysis render it admissible that the influence of this second group of conceptions caused the displacement of amyl to propyl. Propyl is, so to say, the mean idea between amyl and propyl�a; it got into the dream as a kind of compromise by simultaneous condensation and displacement.

The need of discovering