The material enables us to understand the structure of the rumour, but psychoanalysis cannot rest satisfied with that. The why and wherefore of the whole manifestation demands further knowledge. As we have seen, the teacher, astonished by this rumour, was left puzzled by the problem, wondering as to its cause and effect. How can a dream which is notoriously incorrect and meaningless (for teachers are, as is well known, grounded in psychology) produce such effects, such malicious gossip? Faced by this, the teacher seems to have instinctively hit upon the correct answer. The effect of the dream can only be explained by its being "le vrai mot de la situation," _i.e._ that the dream formed the fit expression for something that was already in the air. It was the spark which fell into the powder magazine. The material contains all the proofs essential for this view. I have repeatedly drawn attention to their own unrecognised participation in the dream by Marie's school-companions, and the special points of interest where any of them have added their own phantasies or dreams. The class consists of girls between twelve and thirteen years of age, who therefore are in the midst of the prodromata of puberty. The dreamer Marie X. is herself physically almost completely developed sexually, and in this respect ahead of her class; she is therefore a leader who has given the watchword for the unconscious, and thus brought to expression the sexual complexes of her companions which were lying there ready prepared.